Tithes to the Fae Queen

Flash(You may cast this spell any time you could cast an instant.)
Whenever an opponent casts a spell, add {1} to your mana pool, unless its controller pays {1}. Mana added this way doesn't empty your mana pool as steps and phases end.
"All flora and fauna of this land is Queen Oona's. As such, there's a price to using our mana."
-Fae Rogue