ATLA cards (avatar the last airbender)

[ukdl123]

So far, I've only come up with aang. I'm hoping to expand and make a whole set, but for now this is it. It may seem a little OP, but trust me, it's too much of a pain and too hard to sustain for it to be that powerful.

{LORE: this card cannot be normal summoned or set. this card can only be special summoned by tributing 5 monsters. This card  cannot be destroyed by battle. This card is unaffected by card effects. If this card is changed to defense position, destroy this card. During each of your standby phases, this card gains 200 ATK.}

[HugPhoenix]

it IS overpowered:
-easy summon with field swarming decks
-no maintenance cost
-cannot be removed from the field in any way.
-cannot change position unless the player willingly does so.
-immune to almost everything.
-the only counters for this would be Volcanic queen, lava golem.

[ukdl123]

that's the point, but another big thing is that if you calculate it out, summoned skull could ruin you in a few turns, due to the fact that it's very weak at the start. I tested it in a deck that had 3 scapegoats, and even then it was really hard to summon. also, there are cards such as Alector, Sovereign of birds that could negate its effect for a turn and annihilate it, as it doesn't say that its effect can't be negated. Thanks for the criticism.