Imperiosaur

Creature — Dinosaur

Spend only mana produced by basic lands to cast this spell.

5/5

2021-03-19:
If a triggered mana ability produces mana when a basic land is tapped for mana, that additional mana is produced by the source of the triggered mana ability, not by that basic land.
2021-03-19:
If a basic land gains a mana ability, mana produced with that ability can be spent to cast Imperiosaur.
2021-03-19:
An effect that allows you to spend mana as though it were mana of any type to cast Imperiosaur won’t allow you to spend mana from a source other than a basic land to cast it.