This mechanic can also be used offensively to slow your opponents down, but Appa's ability is only defensive in this specific case
I definitely struggled to make synergy decks in my sealed pools, but thats the luck of the draw
To play a Trainer, just put it into play from your hand and follow the instructions, even if they contradict rules, such as allowing an Asleep Pokmon to retreat
You just end up with a deck with an extra dead card and an extra unplayable card
For starters, Gev has the Ward Pay 2 life ability, requiring opponents to chip away at their own life totals for a chance at removing this card from the board
Cards like Prosper, Tome-Bound, Faldorn, Dread Wolf Herald, and Party Thrasher reward you and enable you