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Legality
Format | Legality |
1v1 Commander | Legal |
Alchemy | Legal |
Archenemy | Legal |
Arena | Legal |
Block Constructed | Legal |
Brawl | Legal |
Canadian Highlander | Legal |
Casual | Legal |
Commander / EDH | Legal |
Commander: Rule 0 | Legal |
Custom | Legal |
Duel Commander | Legal |
Gladiator | Legal |
Highlander | Legal |
Historic | Legal |
Legacy | Legal |
Leviathan | Legal |
Limited | Legal |
Modern | Legal |
Oathbreaker | Legal |
Pioneer | Legal |
Planechase | Legal |
Pre-release | Legal |
Quest Magic | Legal |
Standard | Legal |
Tiny Leaders | Legal |
Vanguard | Legal |
Vintage | Legal |
Tainted Observer
Creature — Phyrexian Bird
Flying
Toxic 1 (Players dealt combat damage by this creature also get a poison counter.)
Whenever another creature enters the battlefield under your control, you may pay . If you do, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)