There are many ways in UW to pop off with this (tapping and untapping, for instance), but you dont really even need them to enjoy the value that Shorikai brings
It's also the first token mechanic designed specifically for multiplayer play
Theres certainly a universe's worth of collectibles to parse through
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I wanted some number of spells that your opponent doesn't gain value off of, since so many of your win conditions reanimate their stuff as well
Theres not enough of a reason for you to play the Giants rather than other creatures, at least not enough to justify playing something like Crystalline Giant over Anax, Hardened in the Forge