Silver the Hedgehog

At the beginning of your end-step, if you've taken
6 or more damage this turn, tap up to two permanents target opponent controls. They
don't untap for as long as you control Silver the Hedgehog. Then if that opponent has six or
more tapped permanents, transform Silver the Hedgehog.
"There has to be a way. If you say it exists in the
past, present and future, I'll destroy them all at once!"
- Silver the Hedgehog