Once An Explorer

Limbo, Elder Evil, {w/b}{w/b} Regenerate & Tribute 3
When this creature enters the battlefield for each {b} spent to cast it, each player loses 1 life & for
each {w} spent you gain 1 life. You choose the
color combination if you didn't spend mana to
cast this creature. If Tribute wasn't payed, you
may repeat the above effect or draw 2 cards.
Canvas- If there are 4 or more Aberrations this creature gains Exalted, Haste & Menace.