The answers were generally either very narrow (Disenchant-effects) or expensive and clunky (Oblivion Ring)
A copy of a spell can be countered like any other spell, but it must be countered individually
1000 sets is the minimum order, which means you have to spend at least $800
Yes, it takes a lot of mana to cast, but you can also immediately generate an additional 15 mana after casting it
Path to Exile and Rapid Hybridization provide some instant-speed removal, Chart a Course , Cut a Deal , and Rowdy Research provide card draw, and Calamity of Cinders , Dusk/Dawn , and Time Wipe are your requisite board sweepers
Because decks running a lot of cheap mana ramp will be less reliant on their lands to cast their spells, those will tend to run fewer lands