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Legality
| Format | Legality |
| Alchemy | Legal |
| Archenemy | Legal |
| Arena | Legal |
| Casual | Legal |
| Commander: Rule 0 | Legal |
| Custom | Legal |
| Gladiator | Legal |
| Historic | Legal |
| Historic Brawl | Legal |
| Limited | Legal |
| Planar Constructed | Legal |
| Planechase | Legal |
| Quest Magic | Legal |
| Vanguard | Legal |
Skullpiercer Gnat
Creature — Phyrexian Insect
Flying
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
Whenever Skullpiercer Gnat deals combat damage to a player, a random nonland card in that player's hand perpetually gains "When you cast this spell, you get a poison counter." (Perpetual effects that are given to cards are permanent effects regardless of what zone those cards are in and what zone they move to.)