What it does
Affinity reduces a spell's casting cost based on how many of a certain thing you control—most commonly "affinity for artifacts," which lowers the cost by 
for each artifact you control. So if a spell costs 
and you control four artifacts, you pay . Affinity only reduces generic mana, never colored requirements, so a spell costing 
can drop to but no lower than its colored pips.
The big misconception: affinity is a cost reduction applied when you cast the spell, not an alternative cost or a discount you choose. It counts artifacts as the cost is locked in, including the spell itself isn't counted (it's not on the battlefield yet), and it stacks with other reductions.
In Commander, affinity shines in artifact-heavy decks, enabling explosive turns where treasures, mana rocks, and tokens let you deploy big threats for nearly free.
for each artifact you control. So if a spell costs and you control four artifacts, you pay . Affinity only reduces generic mana, never colored requirements, so a spell costing can drop to but no lower than its colored pips.
The big misconception: affinity is a cost reduction applied when you cast the spell, not an alternative cost or a discount you choose. It counts artifacts as the cost is locked in, including the spell itself isn't counted (it's not on the battlefield yet), and it stacks with other reductions.
In Commander, affinity shines in artifact-heavy decks, enabling explosive turns where treasures, mana rocks, and tokens let you deploy big threats for nearly free.Iconic cards with Affinity
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