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I know there are cards like Gemhide Sliver which let slivers tap for mana. Convoke lets all creatures do this once. Paradise mantle gives a creature this ability. But these examples only let the creature(s) tap for one mana.
Is there a permanent that lets creature/creatures tap for two mana rather than one?
I know there are creatures that can tap for 2 or more mana (like Incubation Druid and Gyre Engineer) but I want to give a creature the ability rather than have a creature with the ability.
Murgatroid99 gave excellent answers for what you specifically asked for. However, another route is to increase the mana generated by the mana source. Say for example, your creature is equipped with Paradise Mantle (there are lots of ways for creatures to generate mana. That's just one.) Then