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A Magic: The Gathering card from the "Phyrexia: All Will Be One Commander" set features "Norn's Choirmaster," a Phyrexian Angel with flying and first strike. This 5/4 creature triggers the proliferate mechanic when a commander enters the battlefield or attacks, greatly enhancing its strategic impact.

Norn's Choirmaster [Phyrexia: All Will Be One Commander]

ๆฅ่‡ช Magic: The Gathering
$2.15 - $4.30
$4.30
$2.15 - $4.30
$4.30
Set: Phyrexia: All Will Be One Commander
Type: Creature โ€” Phyrexian Angel
Rarity: Rare
Cost: {3}{W}{W}
Flying, first strike

Whenever a commander you control enters the battlefield or attacks, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)