For example, during a Murders at Karlov Manor Limited event, you can't add Slime Against Humanity from your personal collection
The starting life clause is the whole point: This black board wipe gets turned on very easily in Commander once somebodys been smacked around, although it may be too slow to be useful as a speed bump against aggro decks in the early game
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It's a better finisher, but it cannot be used to kill a dork like your Blaze variant, but still, this is clearly going to be a better class of card
Maze of Ith can disrupt attackers, Vesuva clones lands, Field of the Dead spawns Zombies
Really you need cards with convoke to be playable at base cost, both in terms of value and physically