Lone Rider // It That Rides as One

First strikeFirst strikeDeals combat damage before creatures without first strike., lifelinklifelinkDamage dealt by this also causes you to gain that much life.

At the beginning of the end step, if you gained 3 or more life this turn, transformtransformTo mill a card, put the top card of your library into your graveyard. this creature.

First strikeFirst strikeDeals combat damage before creatures without first strike., trampletrampleExcess combat damage it deals to a blocker carries over to the player or planeswalker it's attacking., lifelinklifelinkDamage dealt by this also causes you to gain that much life.