The fact that it has no retreat cost means you can be always rotating them and, being an evolution Pokmon, can even be healed with Cherryl
To state some of its possible combos, this card allows Donphan ex can further increase the damage cap of Phanpy's Flail or further increase Alcremie's Sweets Overload by making it use Slurpuff's Sweets Relay
Carnage Tyrant Carnage Tyrant isnt super splashy, but its very consistent which is often better
I understand attacks can help with set up, but they also can do strong damage
Even with the 50% more effect than Sleight you will find that Adventurous Impulse is less good sooner than the maths would suggest (ie when your deck is a third non-creature, non-land cards)
This set introduces mechanics focused on speed and power, providing strategic options for players