They create value fast, fit into many decks, and stay relevant even years after printing
Plus, in the right deck, you can still often cast Thought Monitor for just one mana, although thats more difficult to pull off
As an example, many are live now
Aven Interrupter plots it from the stack
$0.35 Bombardment (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $0.35 Control Win Condition (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $0.79 One with Death (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $2.79 Barry's Land (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $0.99 Time Sidewalk (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $2.29 Mirrored Lotus (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $0.35 Maro's Gone Nuts (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $0.79 Personal Decoy (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $0.35 Experiment Five (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $0.35 Lazier Goblin (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $0.35 Ral's Vanguard (No PW Symbol - Not Tournament Legal) Mystery Booster/The List $1.99 Sliv-Mizzet, Hivemind (No PW Symbol - Not Tournament Legal) Mystery Booster/The List 0 results found
My opponent controls Sunstreak Phoenix, a Flying creature
