every pokemon card Collecting all cards in order of pokedex number I looked at (almost) every

No way it could be anything else Gore-horn

Assuming its turn three, you can now swing in with your Kiln Fiend, protect it with Force of Negation, Lightning Bolt either the blocking creature or the opponent, and then cast Temur Battle Rage to do up to twenty-three damage depending on other blockers and whatnot

It even becomes a threat dhould you break into three or more colors

Usually from shady sources that arent accountable and thrive on secrecy

Legendary Creature - Human Warrior Wrenn and Realmbreaker Lands you control have ": Add one mana of any color." +1: Up to one target land you control becomes a 3/3 Elemental creature with vigilance, hexproof, and haste until your next turn