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One of those things is writing about the best format ever

When the triggered ability resolves, first the player whose turn it is (if it isn't your turn) chooses which creature they will sacrifice, then each other player in turn order does the same, then all chosen creatures are sacrificed at the same time

Countermagic It is nice to have the odd counter in the slower lists as they are such rounded means of protecting and disrupting

These creatures let you mill dozens of cards per turn, and they get better with untap effects like Unstoppable Plan

Attended Healer is a lifegain payoff that gives you Cat tokens, and Cat Collector is effectively identical