While everything on this list might be called playable there is not all that much relatively that you would want in cube
And that is why I really like having Initiative creatures in my cube yes, they have a tendency to warp the games in which they are played, but so does Sneak Attack and even Sol Ring to some extent
This is where you're given a limited number of cards to start with and have to build a deck with those cards
When you reach the parameter you want to change, press Button 3 to enter edit mode, then adjust the value with Button 1 (up) or Button 2 (down)
Surge's Strategy because it could make infinite combos with itself and any card that allowed the player to play additional supporter cards in their turn
As Slicer, High-Speed Antagonist it switches out double strike for first strike, keeping haste, and when it deals combat damage to a player, it converts back to its front side