#1 We'll need to wait for the release notes for an "official" ruling, but my impression is that an X spell can still be cast as long as its final CMC, counting the announced values of any variables, is odd
Whenever Tectonic Giant attacks or becomes the target of a spell an opponent controls, choose one Tectonic Giant deals 3 damage to each opponent
No wonder you can't use it in Standard, though, since it was printed in a Commander precon
It consistently discounts your instants and sorceries and makes for a supreme spellslinger commander that offers a playstyle unique to the goblin tribe
Locations are also very hard to remove, as theres little targeted removal for them yet, making it a tough deck to deal with
It also presents quite the clock, turning a handful of ninjas into truly deadly assassins while flipping up cards like Shadow of Mortality and Dig Through Time