Frenetic Efreet + Karplusan Minotaur + Gideon of the Trials

Prerequisites

Karplusan Minotaur has indestructible, protection from red or protection from creatures. You have Gideon of the Trials' emblem. Gideon of the Trials is on the battlefield, or you control a Gideon planeswalker.

Steps

1. Activate Frenetic Efreet an arbitrarily large number of times by paying {0}.
2. Resolve a Frenetic Efreet ability, causing you to flip a coin.
3. Karplusan Minotaur triggers. If you won the flip, it deals 1 damage to any target you choose. If you lost the flip, it deals 1 damage to a target of an opponent's choosing. You cannot lose the game due to this damage due to Gideon of the Trials, and Karplusan Minotaur cannot be destroyed due to its indestructibility or protection.
4. Repeat from step 2.