Your search for "Slayers' Stronghold 318" revealed the following:
Slayers' Stronghold (C21) from Commander 2021, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Karl Kopinski Card Text:T: Add C.RW, T: Target creature gets +2/+0 and gains vigilance and haste until end of turn.
Slayers' Stronghold - Commander Deck (CMR) from Commander Legends, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Karl Kopinski Card Text:T: Add C.RW, T: Target creature gets +2/+0 and gains vigilance and haste until end of turn.