being a two-mana counter to Hordeling Outburst that doesn't cost a card), the big deal is that it stops Collected Company and Deathmist Raptor while also grabbing some fringe value against manifest , Hornet Nest and Whip of Erebos
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
Obviously enough, youre usually going to pay in installments, but the fact that you can draw this early and have it be an amazing threat or draw it late and have it be an amazing threat makes it an excellent card
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
This five-mana legendary creature comes with several abilities tied heavily to the monsters lore