Angel of Serenity

(T: Add U.)

Scavenge 5G (5G, Exile this card from your graveyard: Put a number of +1/+1 counters equal to this card's power on target creature. Scavenge only as a sorcery.)

Players can't gain life. At the beginning of each player's upkeep, that player loses half their life, rounded up.

(T: Add B.)

BR: Target blocking creature gets -1/-1 until end of turn. BR: Target player who lost life this turn loses 1 life.

Until end of turn, target creature gets +1/+0 and gains first strike and lifelink.

Whenever a creature you control dies, put X +1/+1 counters on target creature you control, where X is the power of the creature that died.

Whenever another creature you control enters, you gain life equal to that creature's toughness. 1GW, T: Populate. (Create a token that's a copy of a creature token you control.)