Lotus Petal

{T}, Sacrifice this artifact: Add one mana of any color.

Dark Ritual

Mox Diamond

If this artifact would enter, you may discard a land card instead. If you do, put this artifact onto the battlefield. If you don't, put it into its owner's graveyard.
{T}: Add one mana of any color.

Mai, Scornful Striker

First strike
Whenever a player casts a noncreature spell, they lose 2 life.

Lion's Eye Diamond

Discard your hand, Sacrifice this artifact: Add three mana of any one color. Activate only as an instant.