Conquest, the Ray Of Sun

+2: Target land gets 5 +1/+1 counters and becomes a 0/0 elemental creature with lifelink and vigilance, untap this land
-X: Target land gets X +1/+1 counters
-15: Take control of all lands, put ten +1/+1 counters on them and they become 0/0 elemental creatures with lifelink and vigilance