There are a lot of different decks seeing play in Arena's Explorer format, so it's good to know which cards to have at the ready against certain archetypes
The Spear destroys any non-land permanently at instant speed, and it's not impossible to get that two cost reduction
These were a huge hit in multiple competitive formats, so putting the rest of the cycle high on this list is a no-brainer
Ursula, Deceiver of All Into the Inklands, Enchanted ($350) The third set to be released for Lorcana, Into the Inklands, brought an exciting new element to the game: Location cards
You could easily just swap in Walking Ballista, Heliod, Sun-Crowned and a tutor or two if that's your style
#4 Also, when considering a planeswalker around a certain mechanic, remember that each ability doesn't have to involve the mechanic itself