Mindstealer Sphiranx

(Yasova Dragonclaw)
Trample
At the beginning of combat on your turn, you
may pay {1}{u/r}{u/r}. If you do, gain control
of target creature an opponent controls with
power less than Mindstealer Sphiranx power
until end of turn. untap that creature, and it
gains haste until end of turn.