AffinityAffinity is a static ability that functions while the spell with affinity is on the stack. “Affinity for [text]” means “This spell costs less to cast for each [text] you control.”
If a spell has multiple instances of affinity, each of them applies. (CR 702.41) for tokens (This spell costs
less to
castTo cast a spell is to take it from the zone it’s in (usually the hand), put it on the stack, and pay its costs, so that it will eventually resolve and have its effect. A player may cast a spell if they have priority. See rule 601, “Casting Spells.”
To cast a card is to cast it as a spell. (CR 701.5) for each token you control.)
Whenever a token you control enters,
tapTo tap a permanent, turn it sideways from an upright position. Only untapped permanents can be tapped. (CR 701.26) target nonland permanent an opponent controls. It doesn't
untapTo untap a permanent, rotate it back to the upright position from a sideways position. Only tapped permanents can be untapped. (CR 701.26) during its controller's next
untapTo untap a permanent, rotate it back to the upright position from a sideways position. Only tapped permanents can be untapped. (CR 701.26) step.