Stalwart Successor | Blasting Station (and one other card)

Persist Creature

Cards

Activate
Blasting Station by tapping it and sacrificing the creature with persist.
When that creature dies, its persist ability triggers, returning it from your graveyard to the battlefield with a -1/-1 counter on it.
When that creature enters,
Blasting Station and
Stalwart Successor trigger.
Resolve the
Blasting Station trigger, untapping it.
Resolve the
Stalwart Successor trigger, putting a +1/+1 counter on the Persist Creature.
Remove a +1/+1 and a -1/-1 counter from that creature as a state-based action.
Resolve the
Blasting Station ability from step 1.
Repeat.

This combo has been estimated to be Exhibition (Bracket 1+).