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A summon is a saga creature, so it works exactly like a saga: Once you reach the final chapter, and its triggered ability resolves, you have to sacrifice the saga
Pokemon company should really hire him to replace some of their current artists and continue to release new like Lugia, Darkrai, etc
As the match progresses, though, this becomes a weaker option but can be used to give your other Grass-type strategies a bit more sting
In particular, I think the bar for non-creature ramp cards like Kodamas Reach is much higher in a deck like this
Being able to Gift the player at the table with the weakest board position an extra turn to enable you to advance you battlefield presence through your own extra turn could be quite nice