shuffle them both into the Deck, then draw 1 card
From there you play monsters, spells and trap cards, and then attack your opponent, trying to crush their monsters and chip away at that all-important LP
Youre in blue, for crying out loud
Then digivolve Millenniummon into [BT19-075 Moon=Millenniummon] and reduce the cards in your opponent's hand, remove their Tamers, and reduce the cards in their security stack
Creatures (22) 2 Elvish Visionary 3 Courser of Kruphix 4 Satyr Wayfinder 4 Siege Rhino 4 Den Protector 3 Deathmist Raptor 2 Nissa, Vastwood Seer Planeswalkers (2) Lands (24) Spells (12) This list is a little lighter on removal than Id like, so we probably need to trim a couple bodies, but the main thing is just using Evolutionary Leap as a source of card advantage that also happens to brutally punish opponents who rely on removal