BPhillipYork: I like the trigger, it's fun for some Grixis "cast from places other than your hand" deck
Building monobrown in Old School, you can basically go two ways: Prison-ish or midrange bigboys aggro
The trouble comes when its early game and youve got a board wipe in hand, not enough mana to cast it and only one main threat to deal with anyway
In Commander, this card works great in token strategies, pairing nicely with things like Jaheira, Friend of the Forest to create an army of tasty Frogs
It creates an interesting design which is more sky than land, and has some unique rock designs adding interest to the landscape
If an Aura becomes attached to Siona that causes it to lose all abilities, Siona's last ability won't trigger