2 - Electro, Assaulting Battery Another mono Red option, Electro, Assaulting Battery could be ideal for spellslinger decks since it stores red mana, then adds red mana as you play instants and sorceries
Even just one or two dragons with double strike can turn combat into a complete bloodbath, and if your deck is packed with flying threats, Atarka ends games almost out of nowhere
Theres a lot of free equipping going on (more on that later) and so I want to get a built-in creature to go with it
When you do, put two +1/+1 counters and a flying counter on target attacking creature
Below is a complete table of reprinted cards that have the Planeswalker symbol in Mystery Booster 2
Riftbound: League of Legends Lorcana One Piece Star Wars: Unlimited Gundam Bulk Magic: The Gathering Pokemon Yu-Gi-Oh