Buxton, Decorated Host

Convoke (Your creatures can help cast this
spell. Each creature you tap while casting this spell pays for {1} or one mana of that creature's color.)

At the beginning of your end stp, if you control a tapped creature, reveal cards from the top of your deck until you reveal a nonland permanent card
with mana value X or less, where X is the number
of tapped creatures you control. Put that card onto the battlefield and the rest on the bottom of your library in any order.