Experiment Five

: Put a +1/+2 counter on Experiment Five. ( is paid with one mana from any source that could produce two or more colors of mana.)

Problematic Volcano

When Problematic Volcano enters the battlefield, it deals 4 damage to any target. Then, starting with you, each player assigns their creatures to the left or right of the volcano. Creatures enter the battlefield to the left or right of the volcano.
Creatures can’t block creatures on the other side of the volcano.