Umbet, Wild Patron

Haste, Trample
{u}{r}{g},{t}: Creatures you control get Trample.
At the beginning of each combat, check if:
-You control a creature with power 4 or greater other than Umbet, Wild Patron
-You have 4 or more cards in your hand
-You have 8 or more lands
Each source that would deal damage this combat deals an additional X damage, where X is the number of conditions met.