Nightblood, Insatiable Blade

Equipped creature has first strike, trample, Cumulative upkeep—pay {e} and 1 life, and "Whenever this creature deals combat damage to a creature, exile that creature."
Equipped creature gets +2/+0 for each age counter on it.
Pay 3 life: Attach Nightblood to target creature you control. Activate this only if Nightblood is not equipped to a creature.