I see, but why would "Super Sonic Team" appear as a new creature? It doesn't make sense. It makes sense with the Keldra equipment, since it makes a Keldra ghost. But the other problem with Super Sonic Team is where would all that text go? It would be like a whole new paragraph on all three cards, which we already have full of abilities.
The wall is much more complicated with that. Because it deals damage to attackers frome the graveyard, which is tough to word, also it counts creatures which are attacking "it" which isn't possible. I am not sure how Zerruco wanted this to read. If you want it to do damage to each creature that attacks from that point on then it should almost be a new keyword, one that allows it to work from the graveyard. "Anytime an opponenets creature attacks, Bowsers Castle deals 1 damage to that creature" and then a new word like "Curse" which will be the lurking effect when this card goes to the graveyard (from play? or from anywhere?). Or it could read "Whenever an attacking creature an opponenet controls becomes blocked, Bowser's Castle deals 1 damage to it." Now it is as if all your blockers are in Bowsers Castle and use it's advantages to deal damage to attackers. However I don't see why it still operates from the graveyard. Why can't the castle be broken?
I got a new card though:
Goobma
G
Mushroom?
1/1
Whenever Goomba is the target of a spell or ability, sacrifice it.
Because goombas are mostly worthless. It would simply be a fairly bad card. Kinda like
Squire.
Koopa
G1
Koopa
2/2
When koopa is put into the graveyard from play put a 1/1 indestructable shell token into play under your control that has: "Whenever hoopa shell deals damage to a creature that creatures controller gains control of it."