Foundations

Vizier of the Menagerie

You may look at the top card of your library any time.
You may cast creature spells from the top of your library.
You can spend mana of any type to cast creature spells.

Secret Lair Drop

Amonkhet Remastered

You may look at the top card of your library any time.
You may cast creature spells from the top of your library.
You may spend mana as though it were mana of any type to cast creature spells.

Amonkhet Promos

Amonkhet

You may look at the top card of your library. (You may do this at any time.)
You may cast the top card of your library if it's a creature card.
You may spend mana as though it were mana of any type to cast creature spells.