The second mode drains your opponents, and the third gives you card advantage for each opponent with one or fewer cards in hand, which is relevant if your deck is built around making your opponents discard their hand
It also only requires one Energy to retreat, so its easy to pull it out of danger and swap it with a better Pokmon whos ready to perform a big move
Its delve ability makes it cheaper to cast, allowing you to drop a massive threat somewhat early
I don't know that this combination has a high top-end in terms of power or has good combo potential, but I think these two would work really well together
As you can imagine, these labels are often based on the relatively scarcity of the card, in addition to the power of the card
(It cant be blocked except by two or more creatures.) Creatures target player controls get +2/+0 until end of turn