Additionally, if your opponent has a heavily damaged Pokemon on the Bench, you can bring it forward for an easy Prize Card
BPhillipYork: Flashback effectively being pasted onto all your spells is really solid
While Martyr + [casthaven]Proclamation of Rebirth[/casthaven] is the engine to a more controlling build of Soul Sisters, here it is sacrifice this to turn on [casthaven]Serra Ascendant[/casthaven] or make target burn player cry. Its the most all-in card in this list and while it does synergize well with multiple cards in the deck, its the first thing I would cut if there were no budget considerations
It does other things, but thats the ability you want
When it enters or attacks, you get to either add or remove a charge counter
Even if one of the lands you sacrifice is both a Swamp and a Forest, you have to sacrifice another land that is a Swamp or a Forest