Umbral Mantle + Vhal, Candlekeep Researcher

Prerequisites

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Steps

1. 1Activate Vhal by tapping it, adding at least that cannot be spent to cast spells from your hand.
2. 2Activate Vhal by paying and untapping it, giving itself +2/+2 until end of turn.
3. 3Repeat.

Effects

• Infinite colorless mana that can't be spent to cast spells from your hand
• Infinitely large creature until end of turn