Your search for "Aggressive Crag" revealed the following:
Aggressive Crag - No Symbol (CMB2) from Mystery Booster Playtest Cards 2021, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Demitrios Feredinos Card Text:At the beginning of your combat step, tap CARDNAME.T: Add R or W.
Aggressive Crag - Symbol (CMB1) from Mystery Booster Playtest Cards 2019, available at 401 Games Canada. Rarity: Rare Finish: Normal Artist: Demitrios Feredinos Card Text:At the beginning of your combat step, tap CARDNAME.T: Add R or W.