They could still play the creature, and it would enter the battlefield
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Is Viridian Corrupter legal to play

$0.79 Wall of Omens (0027 - The Imperial City of Archades) Final Fantasy Through the Ages $19.99 Winota, Joiner of Forces (0019 - Bartz Klauser) Final Fantasy Through the Ages $3.99 Farseek (0045 - Newfound Adventure) Final Fantasy Through the Ages $1.99 Laboratory Maniac (0030 - Vana'diel Adventurers) Final Fantasy Through the Ages $3.49 Lightning Bolt (0040 - Thrum of the Vestige) Final Fantasy Through the Ages $2.49 Deadly Dispute (0033 - Baron Rivalry) Final Fantasy Through the Ages $14.99 Teferi, Mage of Zhalfir (0032 - Edea Kramer) Final Fantasy Through the Ages $11.99 Mangara, the Diplomat (0025 - Minwu, Rebellion Strategist) Final Fantasy Through the Ages $5.99 Counterspell (0004 - Wild Rose Rebellion) Final Fantasy Through the Ages $6.99 Syr Konrad, the Grim (0010 - Golbez, Clad in Darkness) Final Fantasy Through the Ages $1.49 Light Up the Stage (0039 - A Promise Fulfilled) Final Fantasy Through the Ages $5.99 Brainstorm (0028 - Endwalker) Final Fantasy Through the Ages 0 results found

Examples include Wall of Earth and Wall of Tanglecord, and three-drops like Wall of Granite, Wall of Stone, Glacial Wall and Wall of Ice