The first of those is Helm of the Host, which is a four mana Equipment that costs five to equip
Bring Twilight Masquerades Frosslass into the mix, and its Freezing Shroud ability will help build up the damage counters even further, adding one to each Pokemon with an Ability during Checkup
Which also works well with cards like Moonshadow, or with Dark Depths and earthbend/awaken
Whether you play one, the other, or both, your Adventure deck is very likely to be aggressive at least all the current builds are and its going to be more resilient than most aggro decks, because both the build-arounds provide card advantage and the Adventure mechanic is in itself a source of it
Get ready to blast off in search of this one
It's cheap, efficient and powerful, everything one'd want from an MTG card