The 151 Charizard ex SIR is the modern hobby's benchmark card: about $410 raw, a PSA 10 that sold for $1,550 this week (roughly two gem copies trade every single day), and the deepest liquidity of any modern single
Also fuels the threshold deck which includes Nimble Mongoose, Mystic Enforcer, and Werebear
Even if one is countered, though, you'll still have another copy ready to go for your next turn, again, provided that the initial copy resolved successfully
Tap a mana and him to sacrifice an artifact and fetch one that's one mana more
If youre drafting a box, may the odds be ever in your favor
My big contribution to echo was the addition of "comes into play" effects