Each time you select that mode, you can choose a different target, or you can choose the same target
Ramp : Ancient Tomb, Sol Ring, Mana Crypt, Mana Vault, Gauntlet of Might, Gauntlet of Power, Extraplanar Lens, Solemn Simulacrum (I'm surprised this card is still expensive despite all the reprints!) Card Draw: Wheel of Fortune, Mind's Eye, Knollspine Dragon Tutors: Gamble, Moggcatcher, Imperial Recruiter Hate: Blood Moon, Magus of the Moon, Stranglehold, Pyroblast, Red Elemental Blast Goblins: Goblin Recruiter, Goblin Ringleader, Kiki-Jiki, Mirror Breaker, Goblin Warchief, Lightning Crafter Kiki-Jiki, Mirror Breaker and Lightning Crafter is an infinite combo
The copy that Ivy, Gleeful Spellthief's second ability creates is created on the stack, so it's not "cast." Other abilities that trigger when a player casts a spell won't trigger
in fact, most of them are just basic lands
Who can tell at this stage just what theyd be able to do for the deck