Play of the Game

six generic mana one white mana Sorcery

Assist (Another player can pay up to six generic mana of this spell's cost.)

Exile all nonland permanents.

The most sensational plays send everyone home breathless.

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Play of the Game rulings

2018-06-08
You may reveal a card with assist and discuss how to pay for it before you begin to cast the spell. Targets are chosen for that spell before you choose another player to help you pay for it and before that player has committed any mana to doing so.
2018-06-08
Only the generic mana portion of a spell’s cost can be paid with assist. Any colored mana costs must be paid by the spell’s controller, even if the assisting player paid mana of that color.
2018-06-08
If an effect allows a player to cast a spell spending mana “as though it were mana of any color” or “of any type,” that player must still pay for the colored mana in that spell’s total cost. That cost doesn’t become generic.
2018-06-08
Assist allows another player to pay for any amount of generic mana. If an effect changes the cost of the spell, the amount that player may pay will be more or less than the amount in the spell’s reminder text.

Play of the Game keyword rules

Assist Rule 702.132

Assist is a static ability that modifies the rules of paying for the spell with assist (see rules -h). If the total cost to cast a spell with assist includes a generic mana component, before you activate mana abilities while casting it, you may choose another player. That player has a chance to activate mana abilities. Once that player chooses not to activate any more mana abilities, you have a chance to activate mana abilities. Before you begin to pay the total cost of the spell, the player you chose may pay for any amount of the generic mana in the spell’s total cost.