Displacer Kitten | Eternal Witness | Lotus Petal

(and two other cards)

Creature That Can Be Cast Using One Colored Mana

Snap in hand.
Lotus Petal in your graveyard.
All other permanents on the battlefield.
You control up to two lands that can tap to produce at least ({1} magic symbol) ({U} magic symbol) .

Activate up to two lands by tapping them, adding at least ({1} magic symbol) ({U} magic symbol) .
Cast
Snap by paying ({1} magic symbol) ({U} magic symbol) .
Displacer Kitten triggers, blinking
Eternal Witness.
When
Eternal Witness enters the battlefield, it triggers, returning
Lotus Petal from your graveyard to your hand.
Resolve
Snap, returning the creature that can be cast using one colored mana from the battlefield to your hand, and untapping two lands you control.
Cast
Lotus Petal by paying ({0} magic symbol) .
Displacer Kitten triggers, blinking
Eternal Witness.
When
Eternal Witness enters the battlefield, it triggers, returning
Snap from your graveyard to your hand.
Activate
Lotus Petal by tapping and sacrificing it, adding one mana of any color.
Cast the creature from your hand by paying its mana cost.
Repeat.
You may instead bounce any creature you don't control to its owner's hand instead of bouncing the generic creature, as long as your opponents control creatures, and net one colored mana per loop.