What this means is that, should the Troll take lethal damage from something (say from combat, or your opponent casting Pyroclasm), the Troll will stay alive as long as you pump two mana into him
If you want to use some of the spellslinger vampires, I recommend focusing on big, flashy spells
For example, if Tom Bombadil is returned to the battlefield by the final chapter ability of Elspeth Conquers Death, it will be on the battlefield in time to see that final chapter ability finish resolving and get removed from the stack, and thus Tom Bombadil's last ability will trigger
As a permanent with negamorph is turned face up, put a -1/-1 counter on it if its negamorph cost was paid to turn it face up
if Sunfrill Imitator copies a legendary creature, Sunfrill Imitator will also be legendary, but because its name remains Sunfrill Imitator, the "legend rule" won't cause either of them to be put into the graveyard
Fast Commander damage or Voltron kill