But while there are many broken things one can build around thanks to Shardless Agent, it is not problematic for the format
2020-04-17 If you reveal a companion outside the game, for as long as it remains there, you may pay any time you could cast a sorcery (that is, you have priority during your main phase and the stack is empty)
It's important to stack the triggers so that the Goblin Cannon doesn't sacrifice until you have pumped enough damage into it
As a point of comparison, in Goldin Auctions' December Holiday Auction, an SGC Gold Label Pristine 10 "1 of 1" Charizard was sold as the first lot for $360,000
Youll have to go on launch day if you want this card
There arent very many scenarios where youd want to skip the ability, though