This spell costs less to cast for each different mana value among cards in your graveyard.
Whenever you discard a nonland card, you may cast it from your graveyard.
Oskar is a discard-payoff engine: load your graveyard with varied mana values to cheapen him, then turn every discard into a free cast from the yard. You fill the bin with cantrips, wheels, and rummaging effects, then chain cheap-to-recast value spells and bombs you discarded.
Turns discard 'downside' into pure card advantage and free casts
Often costs only or less to recast after a single board wipe of value
Excellent with reanimator and cheap-to-recast spell engines
Free, untap-driven looting that turns your graveyard into an engine alongside Oskar.
Add discard outlets that don't cost mana and graveyard-fuel like Frantic Search, Cathartic Reunion, and Tortured Existence. Lean into a tight reanimator or storm-style combo line with Underworld Breach, and run protection plus graveyard recursion to fight hate. Tune your curve to maximize distinct mana values so Oskar consistently costs near zero.
Legendary Creature — Human Wizard
less to cast for each different mana value among cards in your graveyard.
or less to recast after a single board wipe of value