Mana Tithe is excellent against a ritual-combo deck: it can counter a Seething Song, Desperate Ritual, or the critical Seize the Storm itself if they're tapped out from rituals, often blanking their entire turn. Clowning Around's token generation does nothing to disrupt their combo and is too slow to race a deck that can go off for lethal in one turn, so it comes out. Keep your aggressive creatures to pressure them into using mana on blockers rather than rituals, and hold Mana Tithe for their payoff spell rather than an early cantrip when possible. Dispatch and removal remain important to kill Goblin Anarchomancer or Thornscape Familiar before they discount the combo pieces.