Here

In fact, the original idea of this have 4 abilities, here it goes:

Angustia, Unchained Dementia
Legendary Planeswalker - Angustia
2BR

2 - Put a Nightmare counter on target creature. (Nightmare creatures can't block. Whenever a nightmared creature is dealt damage, prevent that damage and remove the nightmare counter).

0 - Take control of target creature with a nightmare counter on it until the end of the turn. Untap that creature. It have haste until the end of turn.

- X - Exile up to X cards from the top of your library or graveyard. Put those cards in your hand in the beginning of the next upkeep.

Whenever a creature deals damage to Angustia, Unchained Dementia, that creature gains a nightmare counter.