Primeval Titan is super banned, along with Protean Hulk and the most evil edrazi ever created Emrakul, the Aeons Torn. Moreover, Primeval Titan was banned back in 2014. it is legal in duel commander though.

Suggestions:

Tokens: Emeria Angel, Hero of Bladehold, Secure the Wastes, Elspeth, Knight-Errant, Elspeth, Sun's Champion, Garruk, Primal Hunter, Armada Wurm, Entreat the Angels, Worldspine Wurm, Advent of the Wurm, Assemble the Legion

Tokens (Part 2): Darien, King of Kjeldor, Gelatinous Genesis, Martial Coup, Mycoloth, Rhys the Redeemed, Wayfaring Temple, White Sun's Zenith

Pillow Fort: Ghostly Prison, Sphere of Safety

Removal: Beast Within, Krosan Grip, Chaos Warp, Qasali Pridemage

Ramp: Oracle of Mul Daya, Solemn Simulacrum, Courser of Kruphix, Skyshroud Claim, Nature's Lore

Protection: Sigarda, Host of Herons, Dragonlord Dromoka

Other: Reliquary Tower, Sensei's Divining Top

thank for the comment. i must say that i don't care much for banned cards, as i play in a group of friends, and i don't want to do tournaments.

your tokens suggestions are great, but my goal is to get out the mana echoes to make plenty of mana, or some enchantments for marath to grow. as my commander, marath is an easily accessible token gnerator and i don't feel i need more generators, but perhaps you have a different view :)

Cathars' Crusade, Ivy Lane Denizen,Basilisk Collar, Keen Sense, Beastmaster Ascension, Warstorm Surge Mirror Entity and Earthcraft.

Return to Dust, Decimate, Pure/Simple, Aura Shards.

Kessig Wolf Run, Mosswort Bridge, Windbrisk Heights, Opal Palace, Sunhome, Fortress of the Legion, Slayers' Stronghold.

here are my two first game with the deck. note that i as missing 4/6 cards but my opponent didn't mind. he was playing W/Blu with Grand Arbiter Augustin IV .

first game, got out plenty of mana and the Illusionist's Bracers with the Steelshaper's Gift. could do plenty of effect with the bracers, so it went smooth

for the second game, i got mana echoes, used the tokens production and combo to generate 30 uncolored mana, and a big fat genesis wave.

Upwelling will let you keep your Braid of Fire mana. Just a suggestion.

it may allow opponent to keep their mana too, and i know that's bad in my meta