Mirko, Obsessive Theorist lets you return a creature from your graveyard to the battlefield, so long as that creature's power is less than Mirko's
The protection is odd and strong, basicallly none of the regualar instant and sorcery speed removal spells can target it, enchantments like O-rings can't target Emrakul, and haste creatures certainly can't damage it, so the main response to be concerned about is removal that doesn't target like a board wipe or edict
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When the poem is finished, the foe will be no more
Zenos yae Galvuss dragon flip mode is also fairly easy to pull off, as youll just need a Sephiroth's Intervention for its so-called friend. Seifer Almasy Rafiq-style double strike is a great start, but Seifer Almasy has plenty more to offer
when it is, its more often as a rider on an already powerful spell like Mirror Entity, Mutavault, or Crib Swap, not because its essential to keep a tribe together