If your deck is colorful and full of 5+ cost cards, then Veloheart Bike seems like an excellent inclusion
For example, Katara, Water Tribes Hope allows you to pay X mana to give all your creatures base power and toughness X/X until the end of the turn, but you can tap artifacts or creatures to help pay some of that cost, similar to the Convoke mechanic
Those who played back when it was legal know how often the game would revolve around a Prophet of Kruphix Recurring Nightmare The play pattern of repeatedly looping the same creatures, and without an interaction window because the returning of the enchantment is a cost, and the combo potential, leads to a card that is more likely to create harm and frustration than good
Can you talk a bit about how you fit Spider-Mans characters or themes into Magics color pie
While Lorwyn is a land of eternal day and flower-filled meadows, Shadowmoor is one of endless night