Kargron, Nature's Havoc

Dinosaur creatures you control have haste and "{r}: This creature gets +1/+0 until end of turn."
{3}{r/g}: Dinosaur creatures you control gain trample until end of turn. Until end of turn, whenever a Dinosaur you control deals combat damage to an opponent, search your library for a basic land card, put it onto the battlefield tapped, then shuffle your library.