Every card that exists on Arena and is legal in Pioneer is legal in Explorer, and nothing more than that
Many ways of turning them into creatures will turn them into 0/0 creatures, so unless something else is raising their toughness, they'll immediately spoil
This gives players a ton of deck-building freedom and affords many opportunities to play classic cards and nostalgic favorites
These cards are harder to find than usual with them being the second-highest rarity in the set behind Enchanted, but if you are able to get your hands on a playset of these they are great cards to build around
Recursive, and the Swamp sacrifice is the only part that's a brake, and with Urborg
From the beginning, this card had Commander staple written all over it, so the initial demand is understandable