Geosurge
{R}{R}{R}{R}
Sorcery
Oracle Text
Add {R}{R}{R}{R}{R}{R}{R}. Spend this mana only to cast artifact or creature spells.
Watch Out
Mana abilities don't use the stackRules Note
If this card's activated ability produces mana and doesn't target, it's a mana ability. Mana abilities resolve immediately without using the stack — opponents can't respond to them. However, abilities that target (even if they produce mana) aren't mana abilities.