Yeshana, Mischevious Minstrel

Haste
Whenever a creature you control attacks, put a
lore counter on Yeshana, Mishevious Minstrel.
Creatures with power less than the number of
lore counters on Yeshana can't block.
Remove 5 lore counters from Yeshana: Gain
control of target creature until the end step.
Untap it. It gains haste until the end step.