I crack open my ten-card booster and look at all my cards
There are so many +1/+1 counter synergies these days that its incredibly easy to make an oppressively powerful deck with that strategy, and I personally dont like the mental energy required to keep track of all the various triggers those strategies accumulate on the battlefield
You must have legal targets to cast a spell with targets, even if you intend to put it onto the bottom of your library this way
They remind me of giant stuffed animals you get for winning carnival games at fairs, in the best way possible
In fact, Primeval Titan has been the face behind some of the most degenerate decks in Modern, starting with the Cloudpost deck that was prevalent in the initial days of the format, to the Red-Green Valakut deck, and then the Amulet Titan deck both in its degenerate form with Summer Bloom, and the more toned down version we see today with Dryad of the Ilysian Grove and Urzas Saga
If it has at least one target, and all its targets are illegal when it tries to resolve, then it won't resolve and none of its effects will happen
