The efficient mana cost makes it very easy to cast Activated Sleeper after a board wipe to get a copy of the best creature that died or use it to pull off other tricks
The other terrifying thing about Morph, Space Goo, from an opponents perspective, is that it doesnt telegraph what character youre about to Shift to
The selection is absurdly deep, the listing system makes price comparison effortless, and the Cart Optimizer saves money on shipping
There's a lot of staples for Counters decks here, like Inspiring Call, Inexorable Tide, Hardened Scales, and it's the first time we've seen Damning Verdict reprinted, one of the best cards for a Counters deck as a one-sided wipe and it was quite expensive for that reason
You get Charizard, Pikachu, Gengar, all the OG crowd-pleasers