SNKRDUNK eliminates that risk
Interestingly, there are only two trainer cards in the list, Misty from Gym Heroes and N from Noble Victories
Theres almost certainly no better assurance of reliability than Ultra Pro
Phyrexian Walker You need to be playing something desperate for a creature to attack for Phyrexian Walker to be a useful play, such as Yuriko, the Tiger's Shadow
Kolvori, God of Kinship / The Ringhart Crest If you control three or more legendary creatures, Kolvori, God of Kinship gets stronger and gains vigilance
As we learn what mechanics the set wants to care about, we preserve the flavor so that players can still point at a card and say, "Yeah, that feels like this character." But during this first phase of Magic: The Gathering | Marvel's Spider-Man 's design, we didn't need to worry about that