Treebeard's Dilema

Choose one —
• At the beginning of your next upkeep support
X, then support X. (Put a +1/+1 counter on each
of up to X target creatures.)
• At the beginning of your next upkeep, choose
up to X creatures you control. They deal damage
equal to their power to target creature an
opponent controls. That creature deals damage
equal to its power, divided as its controller
chooses, among any number of those creatures
chosen.