Then, I would cast Wild Nacatl and end my turn.Then, he could cast Reality Smasher and swing with both.

I would take the 9 damage, turning my life at 5. EOT, lavamancer's effect to deal 2 damage and making him at 9.

In my turn, I would attack with everything and give 4 damage Boros Charm, ending the game.

At leats this would be my play.

Great article, I love them, keep them coming and I'm eager to see others responses and ideas.

I'd probably play out my Rift Bolt in my turn. Then hold the Lightning Bolt up to play at his EOT. I pass.

He plays the Reality Smasher and swings with both the Smasher and the Thought-Knot Seer doing 9 damage and taking me to 5.

At end of turn I play the Lightning Bolt and he's on 10. Then I untap and remove the time counter from Rift Bolt. He's on 7. I draw a card. Then I go to combat and swing with both the Goblin Guide and the Grim Lavamancer for 3. He's on 4. Boros Charm. GG.

If he only swings with one of the creatures not both then things are trickier. So let's say he swings with Reality Smasher. I block with Goblin Guide and I go down to 11. I leave Grim Lavamancer alive. At the end of turn I play Lightning Bolt as I did before and he's on 10.

Then I untap and remove the time counter from Rift Bolt. He's on 7. I draw a card. I Boros Charm and he's on 3. I have no mana left. Let's hope that that turn I drew a burn spell or next turn I draw a burn spell. When I pass I know he's swinging for at least 9 again but I can stop 4 damage with the Grim Lavamancer. If he has no more haste dudes of course. So I'll either be on 6, having taken damage from one Reality Smasher but blocking the Thought-Knot Seer. Or I'll be on 1 if he attacks with a second Reality Smasher. Either way I get one more draw to try to get him from 3 to 0..

I would try to go into all the lines, but being on mobile is annoying

However, if opponent doesn't block, then play Wild Nacatl and suspend Rift Bolt. Chump the seer with the Grim Lavamancer, take 5, next turn Rift Bolt takes them down to 11, attacks bring them to 3, if you drew a land, then bolt them. Otherwise, set up for lethal next turn.

Main thing here is to NOT provoke them into quartering us, by not playing Nacatl. They don't know about the Nacatl, and that is very important.

The eldrazi player seems to be screwed if they do anything wrong, I'd almost be more interested to see this from the Eldrazi's perspective.

But the question here is WHY ARE YOU PLAYING NACATL IN THE FIRST PLACE

Or why aren't you playing deflecting palm, for that matter

1. Swing both creatures- No blocks, you weather the attack and win on your next turn with Rift Bolt off suspend, Lightning Bolt, Grim Lavamancer activation and attack (3+3+2+5=13).

2. Swing 1 creature- Again no blocks, you take the assumed 5 going to 9. On your turn you draw-go unless you get a land, then you draw-land-go. If they attack for lethal you block and Boros Charm to save your guys. If they do not you Lightning Bolt and Grim Lavamancer them on their end step. On your turn as long as you drew one land or a 1-mana burn spell you burn them out. Land is Boros Charm, Grim Lavamancer (3+3+2+4+2=14) burn spell is it and Grim Lavamancer (3+3+2+3+2=13)

3. No attacks- see #2, except you didn't go to 9 before doing it.

I do like the idea of swinging with Goblin Guide for the chance that they do not block though. If they do activate Lavamancer to kill the Seer instead of casting Nacatl. If they don't then that is two free points of damage that you can discount from later in the calculations.

next, if they decide that Reality Smasher is a good play, take the 5. then, on my turn, hit it with the Rift Bolt and then Grim Lavamancer away the last 2 toughness, discarding whatever is an appropriate discard, depending on your draws at this state in the game. if you already got rid of the Thought-Knot Seer, which you probably did or else this situation wouldn't happen (who plays a Reality Smasher when they know it will die the next turn?), you have an extra card to choose from. swing in with Goblin Guide and Wild Nacatl if their board is clear, and if they still have a Thought-Knot Seer, just swing with the Goblin Guide. If they block and you have the right cards, kill their Thought-Knot Seer with a burn spell.

next turn, play around what you drew and what their draw was. after that, if their Thought-Knot Seer is up and you drew a land or a one mana burn spell, hit it with the Boros Charm and a spell, or use the land to ping it with the Grim Lavamancer. start swinging in. if their Thought-Knot Seer is not still up, use the Boros Charm to give the Wild Nacatl double strike, unless the Reality Smasher is a threat, then get it outta there with that Boros Charm and the Grim Lavamancer.

next, bask in the glorious glow of their tears streaking down their face as they realize that you just CRUSHED their eldrazi deck. GG.

Boros Charm for double strike only does 3 damage to them instead of the 4 from using it as burn to the face. You want to do as much damage as you can off of each card.

If we end up playing our Nacatl this turn, the opponent (who now knows our entire hand again) would be well-served to play a 4 mana spell and GQ the Sacred Foundry, taking us off of Boros Charm. This means we can't play it (not that it would be very good, as the opponent will likely be making another creature next turn).

Start by attacking with the Goblin Guide. Our opponent can't block, as we can gun down the Thought-Knot Seer with Lavamancer and he doesn't have a fast enough clock. He'll drop to 11.

After combat, suspend Rift Bolt using the Stomping Ground. Pass the turn, since we can't play the Nacatl.

If our opponent's play is Reality Smasher, he has to leave the Thought-Knot Seer back. Take 5, Lightning Bolt and Rift Bolt him down to 5. Rip a land and you win, otherwise attack Guide into a necessary block and kill the Thought-Knot Seer. We have two more turns to draw a land or another burn spell. If he attacks with the Seer and leaves back Smasher, take 4, don't attack and pass back so you can Boros Charm and block with your Guide.

If our opponent's play is a creature costing 4 or less and the Ghost Quarter, it's harder. We have to draw a white source, as we have to EOT Bolt him and he can respond by GQing the Sacred Foundry. If the creature he plays is Thought-Knot Seer, we are sad.

tl;dr Attack with Guide, suspend Rift Bolt, EOT Lightning Bolt, untap and (probably) attack and find what you need in two draw steps.

During that turn, they're probably going to play Smasher, so next turn, bolt the smasher, discarding the card I just drew, and lavamancer it, clearing it out for Nacatl to swing for 3.

In the event that they play a mimic or something small during their next turn, lavamancer gets pointed at it, rather than the face.

Bear in mind, this is all written without reading other answers, so I'm likely not the only one with this line of play