As far as kill cards go, you really can't go wrong with Elemental Eruption
Attached to an evasive creature like Invisible Stalker, this card ensures your life total never gets close to 0
Red So we have Knowledge Pool, and we have Thousand-Year Storm, and well, Im sure they had a great time together, because now we have Arcane Bombardment
Conclusion Each of the Game Changers are powerful in their own right
They really get back to the basics, and for kids in particular I think they are an effective way to focus not on what Trample does, what Fly does, and so forth but on the REAL way to play the game
Instead of being the one who gets surprised when your opponent casts an instant and boosts their prowess creature, cast your combat tricks to buff your own creatures