Put two +1/+1 counters on each of X target lands you control. They each become 0/0 Elemental creatures with
reach (This creature can block creatures with flying.),
haste (This creature can attack, and as soon as it comes under your control.), and "When this creature leaves the battlefield,
conjure (A conjured card is added to the game.) a card named Forest onto the battlefield tapped." They're still lands.