Id also definitely endorse staying on type with Krenko, Tin Street Kingpin, as youll quickly have more Goblins than you know what to do with
Ascend on a plane or permanent isn't a triggered ability and doesn't use the stack
Armaggon, Future Shark Captain Howler, Sea Scourge Jaws, Relentless Predator Shabraz, the Skyshark (+ Brallin, Skyshark Rider) Shark Shredder, Killer Clone There are five legendary sharks that can be your commander as of Secrets of Strixhaven , but none of them have abilities that care about other sharks
Opponents are forced to weigh their options, as each creature they wish to send your way demands a two-mana tribute
If that is too unnerving, then you and a mate can buy a pack each and go head to head