Desperate Ritual (UMA) from Ultimate Masters, available at 401 Games Canada.

• Rarity: Uncommon
• Finish: Normal
• Artist: Wayne Reynolds
• Card Text:
  Add RRR to your mana pool.
  Splice onto Arcane 1R (As you cast an Arcane spell, you may reveal this card from your hand and pay its splice cost. If you do, add this card's effects to that spell.)