Sometimes youll play it and introduce your pod to the Eldrazi titans on turn 5 or so, other times your hands out of gas and its a crummy topdeck
You must have the actual double-faced card the substitute card is representing with you
The best way to take advantage of it is to hold up enough mana to cast this spell, then wait for what your opponent does
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
However, you can opt out of the receiving end of the site and just use it as a means to send cards to others, then cash out whenever you want to
Genari breaks down the Vintage metagame into nine major archetypes and breaks those down even further into over 20 sub-archetypes