Bakugo, King Dynamight

Haste, menace, go beyond
Whenever Bakugo, King Dynamight attacks add {r}{r}{r}. This mana doesn't leave your pool as
steps and phases end.
As long as Bakugo, King Dynamight has a -1/-1 counter on it, it has trample and has "For each {r} in your mana pool, Bakugo, King Dynamight gets +1/+0" and "{b}{b}: Regenerate Bakugo, King Dynamight".