The Jabberwocky

Trample, renown 2 (Whenever this creature attacks and deals damage to a player, if it isn't renowned, put two +1/+1 counters on it and it becomes renowned.)
Whenever The Jabberwocky deals combat damage to a creature and is renowned, add {b}, {r}, or {g} to your mana pool.
"Beware, my son, the Jabberwock, the jaws that bite, the claws that catch..."