First, Foretell is an amazing mechanic for making an expensive mana cost much more manageable over time
Avenger Of Zendikar (Voxy) Mana Value: 5GG Rarity: Mythic Rare Type: Creature Elemental Stats: 5/5 Card Text: When this creature enters, create a 0/1 green Plant creature token for each land you control
Difficult casting cost, but I could see this as a signpost uncommon in a 3-color set
Then run a percentage formula to come up with the left center percentage
Probably the best argument for me to include Laboratory Maniac, but I'm counting on Elixir of Immortality to keep me from decking myself out rather than the frail Maniac to get me out of having no cards to draw
2017-04-18 A spell with aftermath cast from a graveyard will always be exiled afterward, whether it resolves, its countered, or it leaves the stack in some other way