Lair of the Dragon

Lair of the Dragon enters the battlefield tapped
unless you control a Dragon.

{t}: Add {u},{b}, or {r}
Dragon's Call - If you control a Dragon, you may
choose one —
• {4}{r}: Create a 5/5 red Dragon with flying.
• {2}{b}: Create a 3/2 black Dragon with flying.
• {2}{u}{b}{r}: Create a 4/6 black Dragon Knight
with flying and vigilance.