Atraxa, Praetor's Voice is the world's most popular Commander, and for plenty of good reason
If the threat is meaningful the opponent cannot ignore the body because of the threat it represents (value threat in Reefs case)
If something tries to turn a face-down instant or sorcery card on the battlefield face up, reveal that card to show all players it's an instant or sorcery card
Is there a deck you have your eye on
So what if they know you're coming, combat is no problem when you back up Doran with Bedrock Tortoise, Fangorn, Tree Shepherd, and Ikra Shidiqi, the Usurper
It gives mana for other spells too, so it won't take our tempo off for a turn if we play it later