Knuckles, the Echidna

Trample, Rampage 2 (Whenever this creature
becomes blocked, it gets +2/+2 until end of turn for
each creature blocking it beyond the first.)
{1}: Knuckles gains Flying until end of turn.
When Knuckles dies, you may search your
library for a card named Master Emerald,
reveal it, put it into your hand, then shuffle
your library.
"I will protect the Master Emerald!"