You may need to discard, sometimes at random, or exiling cards with the potential to lose the cards if not played
This one is locked to basic Plains cards, though
An overloaded Mortars might not kill it all but it will kill off most and leave the balance of what is in play rather in your favour
If more than one target is chosen then the targets cannot be changed
It wasn't just that this deck was seemingly very powerful that I was so drawn to it, it had far more to do with having a solid rounded feel, reduced weak spots and a greatly increased range and depth of options
Wand of Wonder by paying , and rolling a d20, forces opponents to exile cards from the top of their library until they exile an instant or sorcery card and let us cast up to X instant and/or sorcery spells from among cards exiled this way without paying their mana costs, where X is determined by our d20 roll and can be 1-3