Three mana is on the higher side for a tutor, but it's a price worth paying for being able to get anything you need into your hand
Similar to Hidden Fatess Rowlet, there is an exception to this
3 Numeron Is The Easiest OTK Deck In Master Duel Numeron focuses on summoning XYZ monsters that have effects that progressively gain attack power to destroy the opponent in one turn
Extra Deck 6 Moon Dragon Quilla X DARK Level 6 [ Dragon / SynchroEffect ] ATK 2500 DEF 2000 "Supay" + 1+ non-Tuner monsters If this card is targeted for an attack: Gain LP equal to half the attacking monster's ATK
While the rest of the deck isnt great there, Angel gives us the opportunity to answer an Emrakul or [casthaven]Griselbrand[/casthaven] every other turn of ours
If your extra creature is bounced or flickered, if it dies, or whatever, it's still a part of the gameyou can replay it, and it adds to your threshold, and so on