If a card is split between two decks, I pick one thats easier to remember where to look
Gwen Stacy/Ghost-Spider (Borderless) Sticking with Gwen, but a much less spooky version, this borderless card shows our heroine relaxing before flipping into action against Electro
The Stoneforged Blade isnt bad, per se, but your deck should already have plenty of impactful equipment in it
If we're going to spend time flipping through our collections, saving pennies to order the cards we need, finding the exact alt-art version of our Commander, choosing the correct color of sleeves, and organizing a night with multiple people in the same place to play a game, it's worth more than a single calculation to figure out how much mana we need, and how much ramp we should run
Thassa, God of the Sea seems like it would be great in a go-wide merfolk deck, and it does have a place there because its activated ability helps with Coastal Piracy types of effects
These are essential for the many infinite combos sacrifice decks can deploy, but they also just make things run smoother