Control / Own When the Magic rules refer to the controller of a card or other object, it means what you would expect: the player who currently has that object on their side of the battlefield, who is responsible for deciding how and when to use it
When one player gains life or draws a card, so does the other
Its common for board wipe cards to depict a massive spell going off that annihilates an entire army of monsters, to reflect its in-game effect
The Uncommon allows players to put up to nine copies of the wraith knight into a deck, which is very powerful in a format like Commander, where players can only have one copy of a card unless otherwise specified
Capricopian Capricopian, aside from being very creepy to look at, is a wonderful opportunity to create political moments because of that activated ability: rather than you paying the , it's the player you're attacking who can
Constructed merfolk decks, especially in Modern, leverage Aether Vial as a way to slip creatures into play under counterspells, and without paying for them