Varun, Watcher of Ages

: Whenever a blue creature enters the battlefield under your control, roll a six sided die, 1-3 draw 2 cards. 4-6: draw 3 cards.
: Whenever a green creature enters the battle field under your control, roll a 6 sided die, evens: You gain 3 life. Odds: You gain 6 life.
-2: Creatures you control get +3/+3, and trample until end of turn. Draw a card.