There will certainly be times where this puts your opponent in a lose-lose situation, since they can neither take all the damage or get the poison counters, but most of the time they can probably find a way to mix and match and survive
Whenever you attack with one or more Elves, populate
Its a pretty sick commander for decks that want to enchant opposing creatures and make them attack each other, though it faces competition in the new Killian
Blue doesn't have solid removal access outside of cards bouncing any permanent - which are usually on spells, not creatures
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