Cavalier of Flame is the most aggressive of the bunch, granting a power buff and haste to your creatures
Frankly, the best reason to play Ride the Shoopuf is to say it every time you cast it
Minsc & Boo, Timeless Heroes I hesitate to call the second ability on Minsc & Boo, Timeless Heroes an ultimate, but it works so well as a sacrifice outlet that burns targets and gives you cards
Gastly is from the Fossil Expansion
It gains "When this creature deals combat damage to a player, sacrifice it and return the exiled card to the battlefield tapped." Timothar's last ability is linked to the ability it grants the Bat token
Then, on their second turn, evolve it into Exeggutor with a single Grass Energy, and they have a potent Mon on the field that can wreak havoc