Cards like Myr Battlesphere and Pentavus are wildly different in power level, and I dont know that a cube that could handle a third turn Battlesphere would ever be interested in casting Pentavus
(2011-06-01) If the original spell isn't exiled (perhaps because it's countered by another spell or ability before Knowledge Pool's second triggered ability resolves), the rest of the ability does nothing
Ive moved away from Wolfwillow Haven because it doesnt help generate extra mana with Circle of Dreams Druid, and I have not found another creature I like in this shell in the two-drop slot other than Tangled Florahedron
That is great for it's cost but I won't be discussing cards like it any more in this list
Then you spend seven mana at any time, not just sorcery speed, to discard X cards from your hand and exile the top X cards from your foe's library and you can play them while exiled for no mana
Howard Lyon, the original illustrator of Cathartic Reunion, knows full well the power of the parable