Artificer

Haste,Artifacts you cast cost {1} less to cast
Artificer enters the battlefield with three creation counters on it
{1},{t}:add a creation counter to artificer
{t}:remove 2 creation counters from artificer,
make a tapped grenade token with {t}: sacrifice grenade, deal 2 damage to any target, or remove 4 creation counters to make a explosive spear with
equip 2 and equipped creature gains +1/+1 and sacrifice explosive spear, deal 4 damage to
any target