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“Mishra’s Toy Workshop” is not an officially released Magic card as of now. If you meant a similar card to “Mishra’s Workshop,” which taps to add three colorless mana for artifact spells, try these colorless mana producers:
1. “Urza’s Workshop” — produces colorless and has synergy with Assembly-Worker.
2. “Ancient Tomb” — adds two colorless but deals 2 damage.
3. “Sol Ring” — artifact, produces two colorless.
All are colorless and ramp artifact strategies.
