Wraith, the Formless - Clone Planeswalker for Oathbreaker

It would be pretty interesting if the second ability could target cards in graveyards too, but that would be pretty busted.

Since Wraith, the Formless is presumably a planeswalker at the time the last loyalty ability resolves, the creatures that become copies of Wraith will also be planeswalkers, but will have zero loyalty counters on them. Because of this, they will die the next time state-based actions are checked (i.e. "immediately"). You may want to mention putting a loyalty counter on each of those creatures or something similar so that they don't die.

This is really cool, I like it a lot

When Wraith becomes a creature, if that creature is not legendary, then Wraith is also not legendary until the beginning of your next upkeep. He also is no longer a Planeswalker, no longer has the planeswalker type Wraith, and is no longer called “Wraith, the Formless”. The trigger from his 0 ability waits until the beginning of your next upkeep, after which Wraith returns to his planeswalker form.

When Wraith becomes a copy of a creature, if he entered the battlefield that turn, the copy Wraith is treated as though it has summoning sickness (unless it has or is given haste).

When Wraith becomes a copy of a creature, he does not copy any counters already on that creature and he does not lose any counters that were on him before he became a creature (including Loyalty counters). While he is not a Planeswalker, damage dealt to him will not remove Loyalty counters from him. Removing the counters another way ([[Hex Parasite]], [[Vampire Hexmage]], [[Price of Betrayal]], etc.) will work and if he has no Loyalty counters when he turns back into Wraith, the Formless, he will die as a state-based action.

However, when Wraith as a copy of a creature receives damage exceeding his toughness and he has no abilities like indestructible or recursive abilities, he will die. Wraith enters the graveyard as the creature he is copying, but when any triggers resolve he stops being that creature and becomes a Wraith planeswalker once again. If Wraith were to become a copy of a creature with power and toughness 0/0, he will die as a state-based action if he does not have +1/+1 counters on himself before he becomes a creature. If Wraith were to become a Legendary Creature that is already under your control, the legend rule still applies and one of them must die as a state-based action. You may choose for Wraith to die in this way.

Because the ability targets, he cannot copy an opponent’s creature with hexproof or one of your own creatures with shroud. He can, however, copy one of your own creatures with hexproof. While he is a creature, opponents can target him with spells that can target creatures, provided he is not hexproof. Also, provided he is not indestructible, any board wipe (think Wrath of God) will destroy him as well. Spells that only target planeswalkers cannot target him (for instance; Lava Spike cannot damage him while he is not a planeswalker).

Any Auras that enchant creatures and Equipment attached to Wraith when he becomes a creature again will either be destroyed or fall off as a state-based action. If an Equipment like [[Grafted Wargear]] were to become unattached in this way, Wraith would not be sacrificed as he is no longer the creature that Equipment was attached to. If the Aura has “enchant target permanent” or “enchant creature or planeswalker” (like [[Kaya’s Ghostform]]), the enchantment would remain attached to Wraith as he changes forms.

If another ability were to change the form of Wraith while he is a creature:

1. That ability turns him into a creature until end of turn - Wraith will become the chosen creature until end of turn, after which he will revert to being Wraith, the Formless and lose the trigger from his 0 ability.

2. That ability turns him into another permanent - For instance, [[Song of the Dryads]]. At the beginning of your next upkeep, he will not revert back into being Wraith, the Formless. The same applies to effects that make permanents into copies of other permanents that does not stop at beginning or end of another phase. Wraith is no longer the initial creature and he no longer has the “until the beginning of your next upkeep” trigger that is supposed to turn him back.

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Additionally, as someone else pointed out, Wraith’s ultimate is supposed to turn creatures you control into Wraith planeswalkers with Loyalty counters, but does not because of the wording. This will be changed to “become copies of Wrath, the Formless with a loyalty counter on each.”