add 1 "Time Stream" from your Deck to your hand
I would perhaps recommend making the ATK boost last until the End Phase, or making the ATK boost permanent, but only equal to the ATK of the banished Space Mermaid (or perhaps half of it, because even then, a Level 2 able to suddenly jump to 2200+ ATK on summon is concerning)
So now you get this graph: The earlier ludicrous 20:1 ratio is now down closer to 6:1 If you tweak the numbers you can get quite different outcomes so always keep your own situation in mind
Facilier, Agent Provocateur can shift for five, meaning you can play it on top of another Dr
(4/8/2016) The abilities that transform a Werewolf back and forth look at the entire previous turn, even if the Werewolf with that ability wasn't on the battlefield for some or all of that turn
Often, more experienced players will buy these as well, as they often offer many energy and trainer cards that are much needed for their decks at an affordable price