Voldaren Bloodcaster // Bloodbat Summoner

Flying

Whenever this creature or another nontoken creature you control dies, create a Blood token. (It's an artifact with "{1}, {T}, Discard a card, Sacrifice this token: Draw a card.")

Whenever you create a Blood token, if you control five or more Blood tokens, transform this creature.

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Flying

At the beginning of combat on your turn, up to one target Blood token you control becomes a 2/2 black Bat creature with flying and haste in addition to its other types.