Plains

Haste Whenever Calamity attacks while saddled, choose a nonlegendary creature that saddled it this turn and create a tapped and attacking token that's a copy of it. Sacrifice that token at the beginning of the next end step. Repeat this process once. Saddle 1

Whenever this creature attacks, reveal the top card of your library and put it into your hand. You lose life equal to that card's mana value if this creature isn't saddled. Otherwise, each opponent loses that much life. Saddle 3 (Tap any number of other creatures you control with total power 3 or more: This Mount becomes saddled until end of turn. Saddle only as a sorcery.)

3: Exile another target creature you control, then return it to the battlefield under its owner's control. Whenever another creature you control enters, you may pay G/W. If you do, put a +1/+1 counter on it. If it's a Unicorn, put two +1/+1 counters on it instead. (G/W can be paid with either G or W.)

T, Sacrifice this token: Add one mana of any color.