Kwain, Itinerant Meddler

Haste Equipped creature gets +1/+1 and has haste. Reconfigure R (R: Attach to target creature you control; or unattach from a creature. Reconfigure only as a sorcery. While attached, this isn't a creature.)

Sacrifice an artifact: Put a +1/+1 counter on this creature. Modular 1 (This creature enters with a +1/+1 counter on it. When it dies, you may put its +1/+1 counters on target artifact creature.)

Equipped creature has hexproof and haste. (It can't be the target of spells or abilities your opponents control. It can attack and T no matter when it came under your control.) Equip 1 (1: Attach to target creature you control. Equip only as a sorcery.)

Enchant creature Enchanted creature gets +1/+1 for each enchantment you control and has first strike.

2, T, Sacrifice this token: You gain 3 life.