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In Commander, it's a no-brainer include for any black-based graveyard strategy

Each slot can drop a retro frame rare (41.7%) or mythic rare (14.8%) card

Theres an argument for putting the elves in this slot solely for having better creature types, but the mana fixing that Birds offers is incredibly powerful

You can focus multiple Birds on a single target to remove it, or spread the damage out to put opposing fliers in trade-down range before combat

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The main thing with Krrik is to aggressively spend your life total to cast black spells, which in turn leads to lifegain