#1: Mana Drain Mana Drain is a strong contender for the best counterspell Wizards has ever produced, and its hugely inflated price tag is a testament to that power
Legality depends on the tournament format -- Fire Recovery can be legal in some formats and banned or restricted in others
Shuffle the remaining card into the Deck
In Commander, you'll be able to make good use of Final Showdown, paying six to destroy all creatures, one more when there's something important you want to protect, and one more when you want to get rid of some pesky indestructible stuff too
A player loses the game after having been dealt 21 damage from one of them, not from both of them combined
Szarekh, the Silent King The problem with Szarekh, the Silent King is that needing to attack is a really slow trigger condition and one that you can only do once per turn