Spiraling Embers

Spiraling Embers deals damage to any target equal to the number of cards in your hand.

Flux

Each player discards any number of cards, then draws that many cards.
Draw a card.

Sandstorm Eidolon

{R}, Sacrifice this creature: Target creature can't block this turn.
Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand.

Verdant Eidolon

{G}, Sacrifice this creature: Add three mana of any one color.
Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand.

Rite of Flame

Add {R}{R}, then add {R} for each card named Rite of Flame in each graveyard.

Manamorphose

Add two mana in any combination of colors.
Draw a card.

Faithless Looting

Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Aurora Eidolon

{W}, Sacrifice this creature: Prevent the next 3 damage that would be dealt to any target this turn.
Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand.

Simian Spirit Guide

Sulfur Vent

This land enters tapped.
{T}: Add {B}.
{T}, Sacrifice this land: Add {U}{R}.

Entropic Eidolon

{B}, Sacrifice this creature: Target player loses 1 life and you gain 1 life.
Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand.

Wild Cantor

({R/G} can be paid with either {R} or {G}.)
Sacrifice this creature: Add one mana of any color.

Mountain

Enigma Eidolon

{U}, Sacrifice this creature: Target player mills three cards.
Whenever you cast a multicolored spell, you may return this card from your graveyard to your hand.