Mother Kos

Reach. This spell costs {1} less for each token you control. Whenever a token enters under your control, tap target creature or artifact. Once per turn, if a token enters under your control, you may activate the ability of a tapped creature permanent without paying its cost, as long as its cost is equal to or less than the number of tokens you control, then tap that permanent. You may activate this effect additional times by tapping tokens equal to the ability’s cost instead of paying it.