dungeon cards mtg Venture Into the Forgotten Realms Commander Upgrade Guide:

Anytime she attacks an opponent, you get to put either an Angle, Demon, or Dragon creature from your hand into play, tapped and attacking that same opponent

By herself, Titania costs 3 mana, while Argoth enters play for free

Looking for that extra stylistic flair for your deck

A few times, I hit a Vampiric Tutor, dropped a second-turn Bitterblossom, found said Vampiric Tutor, and had the game basically wrapped up by casting my Commander on turn three

There are also a couple one-off elder dragons: Modern Horizons 2 printed Piru, the Volatile as the first wedge tri-color elder dragon, and Final Fantasy Commander brought us Hraesvelgr of the First Brood