Of course, if a player has an instant spell with enough untapped mana or a mana ability on a card already on the battlefield, the aftermath spell can be thwarted in some way
This Command costs 1BR to cast, though, so be a little patient for the payoff
if your spell gets countered, you wont draw the card, but the upside is that enchantments are harder to remove
Make some sweet, non-realistic proxies and build a cube, a Legacy deck, a Vintage deck, or a deck for whatever other format you want to play, and have a blast
During each player's turn, that player may cast a spell from among the cards they don't own exiled with Ian Malcolm, Chaotician, the mana of any type can be spent to cast it
When you do, this Siege deals X plus 2 damage to any other target, where X is the number of cards revealed this way