Tribute 1 "Cyber Angel" Ritual Monster from your hand or field; draw 2 cards, then place 1 card from your hand on the bottom of the Deck. For the rest of this turn after this card resolves, you cannot Special Summon monsters, except Ritual Monsters. You can only activate 1 "Merciful Machine Angel" per turn.
Requires you to return a card to the bottom of the deck.
Restricts your Special Summoning for the rest of the turn.
Here are the monsters you can tribute for Merciful Machine Angel’s activation. The best monsters to tribute would be Cyber Angel Benten and Cyber Angel Idaten. Cyber Angel Benten lets you search a Cyber Angel monster from your deck. Cyber Angel Idaten gives all your Ritual monsters a huge attack boost.
If only this card is a quick spell, it's worth running
The problem is cyber angel cards were limited at present, we could not put sufficient cards into the desk in order to use draw cards card. I suggest release partly limited to 2 per type. That can make cyber angel desks playable again. :)