Thassa's Oracle because it single-handedly might force the EDH rules committee to make an EDH ban based on how horribly it impacts cEDH for the first time
And if they do expend resources in removing Iago, thats resources they now cant use to further their own game plan
Kitkallos reads as follows: During your Main Phase: You can reveal 1 Level 1 Floowandereeze monster in your hand and banish 1 Floowandereeze card with a different name from your Deck, then, immediately after this effect resolves, Normal Summon the revealed monster
Repeat as above, passing to the LEFT again
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If this card is Link Summoned, you can negate the effects of all face-up monsters your opponent currently controls