Elite Arcanist + Chakram Retriever + Pact of the Titan + Goblin Bombardment

Elite Arcanist

Chakram Retriever

Pact of the Titan

Goblin Bombardment

How it works

1. Activate Elite Arcanist by paying 0 and tapping it, casting a copy of Pact of the Titan without paying its mana cost.
2. Chakram Retriever triggers, untapping Elite Arcanist.
3. Resolve Pact of the Titan, creating a 4/4 Giant creature token.
4. Activate Goblin Bombardment by sacrificing the Giant, dealing 1 damage to any target.
5. Repeat.

This clever loop centers around Elite Arcanist, which you've prepped by exiling Pact of the Titan so it can repeatedly cast the free 4/4 Giant generator for an activation cost of zero. Every time you cast that spell, Chakram Retriever springs into action with its passive trigger, untapping Elite Arcanist so you can repeat the process immediately without waiting around. Meanwhile, Goblin Bombardment converts your endless parade of Giant tokens into direct damage on the spot, ensuring that your opponents are quickly overwhelmed by the relentless bombardment before the deferred upkeep payment of Pact of the Titan can ever come due.