Thanks to Laurentian for giving me the basics for this deck. if you want to check out the original, head over to Marwyn Elfstorm! Even though that this deck is mainly mana ramp, there are some cards that will help you power up all of your elves and swing in for massive damage.
The primary goal of this deck is to get Marwyn in play turn 2 (or turn 1 on the nut draw with Mana Crypt), with some kind of pump and draw spell in hand. There's a suite of spells and creatures to get 3 mana on turn 2, and you want to mulligan somewhat aggressively for these cards. Next, once you can tap Marwyn for mana you want to get her p/t up by playing elves, and using the cheap pump spells and untap effects. From here you want to be drawing as many cards as possible and using cheap untap and pump effects to create more mana, and then draw more cards. Our goal is to get Temur Sabertooth + Wirewood Symbiote + and Elf in play with 1 counter on Marwyn, or the ability to use any of the untap artifacts to make infinite mana.
I'm not going to detail all the ways to make infinite mana because there are numerous lines. The ones that come up most frequently are:
1: Temur Sabertooth + unused Wirewood Symbiote + cc elf + and an untapped Marwyn (minimum 2 p/t).
With all these creatures in play and an unused Symbiote you tap Marwyn for , bounce the elf and untap Marwyn using Symbiote. Replay the elf (3 p/t Marwyn). Tap Marywn). Activate Temur Sabertooth on Wirewood Symbiote, replay Symbiote.
From here, you have a tapped Marwyn that taps for (3 p/t), and a fresh Symbiote activation. Return the elf to untap Marwyn. Replay the elf (No mana in pool), Marwyn will now tap for (4 p/t). It is critical that you replay the elf before tapping Marywn for mana here, you cannot continue the loop at just 3 p/t.
Tap Marwyn for 4 mana. Use this to return the Symbiote to your hand and recast it (tapped Marwyn, unused Symbiote). Return the elf to your hand to untap Marwyn, and replay the elf. You will have no mana remaining in your pool, and get stuck if you messed up the last step. Marwyn will now be a 5 p/t. From here you can demonstrate a loop that adds an additional each time you repeat it, and you generate infinite green mana (and a lethal Marwyn on attack if she can connect). Note that you can shortcut most of this if you have more than the minimum p/t requirement for Marwyn.
2: Staff of Domination, which requires an elf that taps for 5 mana (priest of titania or Marywn),
3: Umbral Mantle, which needs Marwyn and a total of 6 mana after her first tap activation , or 3 mana and an untapped priest of titania which taps for GGGG).
4: Paradox Engine and Heritage Druid plus a bunch of elves can get the job done, even without Marwyn
5: Paradox Engine and Duskwatch Recruiter with a few non-land mana sources can also put you in the driver's seat
We can win a variety of ways, either by looping Memory Jar + EWitness + Primal Command, Beast Within + Somberwald Stag, or just going the combat damage route. Be careful about what you exile with Memory Jar, careless play could leave you unable to combo off. The primary win condition is to destroy all enemy permanents by looping Beast Within, followed by Somberwald Stag to kill the remaining beast tokens (you will recur the stag with EWitness). Your backup plan is loop Memory Jar to force your opponents to lose by drawing their deck. And of course if all else fails, attack with a Berserk elf-lady.
Things will not always go this nicely due to the high variance nature of a singleton format. Often you will need to chain together a variety of pump, untap and draw spells until you are able to assemble enough pieces to generate mana, even a non-infinite amount. The real trick to piloting this deck is successfully navigating your way through these non-optimal scenarios against a field of counterspells and removal.
