It ramps you into dragons by generating colored mana, and more importantly, it lets you cast dragons directly from your graveyard once per turn
The potential downside to this spell is that it requires an unblocked attacking creature to cast for its sneak cost, and depending on the board state, this might not be granted to you
But its tricky to know which terms a casual listener might need explained in the middle of such a discussion
That said, I think more recent decks have overtaken them
However, you cant simply place the unprotected card in an envelope and send it off
(Note that for Altar of Dementia / Greater Good, its power is actually 1 thanks to Mikeaus buffing it.) Tutors Green Sun's Zenith - T1 into Dryad Arbor is a strong play