Memory Crystal

Buyback 3 (You may pay an additional 3 as you cast this spell. If you do, put this card into your hand as it resolves.) Destroy target enchantment.

Target creature gets +3/+3 and gains flying until end of turn. (It can't be blocked except by creatures with flying or reach.)

Each player chooses from among the permanents they control an artifact, a creature, an enchantment, and a land, then sacrifices the rest.

Whenever this creature attacks, it gets +0/+3 until end of turn.

At the beginning of your upkeep, if you have 10 or less life, you gain 1 life.

Flying This creature can't attack unless you sacrifice a land. (This cost is paid as attackers are declared.)

Each creature you control can block an additional creature each combat.

W, T: Choose target opponent who has more life than you do as you activate this ability. You gain 3 life.