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(Whenever this creature attacks, create X tapped and attacking 1/1 red Warrior creature tokens

The clunkiness with Otharri's reanimation is that if your rebels are on the battlefield and you eat a board wipe then there won't be any rebels remaining to activate its ability

Jet Medallion, Bolass Citadel, draw spells, tutors, and black cards that lack colorless requirements in their mana costs tend to work best with Krrik, as they help you stretch your mana and card access into ridiculously explosive turns that can win you the game on the spot if your opponents dont have access to any interaction

You could even do Voltron nonsense with its magecraft trigger and cards like Temur Battle Rage and Monstrous Rage