It takes a little while to transform Sidequest: Hunt the Mark into Yiazmat, Ultimate Mark, but you do get a removal spell up front, and it costs nothing to get your free Treasures
And at any multiplayer table, especially Commander, there's always big stuff to kill
Claim the Firstborn Threaten effects arent getting cheaper than 1 mana, and the restriction isnt even big
It is yet another format that allows for 60+ cards and plays with 2 players
Modern decks are playing around with Oko, for the ability to depower ridiculous threats and swap around permanents, for a card that wasnt hard to get into play turn two
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