Mishra's Workshop

You can spend the mana on costs on the spell's text.

wotc · 2004-10-04

The mana can't be used to pay Echo costs.

wotc · 2004-10-04

This mana may not be used to pay costs imposed after the spell is initially cast.

wotc · 2004-10-04

This mana may be used on additional costs to cast the spell, such as Kicker.

wotc · 2004-10-04