These are going to be your normal cards that you can find in the play boosters
Moreover, the good Captain seems like a textbook case of a card that was designed for Standard rather than commander
Let's add a bunch of extra attack triggers to the build around things like Aggravated Assault
In many games, the most pivotal decisions will revolve around whether to warp a creature for short-term value (getting a small effect and effectively drawing that creature) or cast it normally for immediate board presence
Arixmethes, Slumbering Isle Awoken Horror Biblioplex Kraken Brinelin, the Moon Kraken Deep-Sea Kraken Grappling Kraken Gyruda, Doom of Depths Gyruda, Doom of Depths Hullbreaker Horror Icebreaker Kraken Isleback Spawn Kraken Hatchling Kraken of the Straits Krothuss, Lord of the Deep Monstrosity of the Lake Nadir Kraken Polar Kraken Reservoir Kraken Rot-Tide Gargantua Scourge of Fleets Shipbreaker Kraken Shoal Kraken Spawning Kraken Stormsurge Kraken The Watcher in the Water Tidal Kraken Tolarian Kraken Trench Behemoth Tromokratis Wrexial, the Risen Deep
As a new ability for this Universes Beyond set, Freerunning is an alternative casting cost that gets unlocked by dealing combat damage with either an Assassin or your Commander