this is really good card because it can transmute any existing card type into any other type. for example an entity (similar to mtg creature) into a structure (similar to former mtg wall) or vice versa.

the reason this is such a power effect is because when a card changes types, it reprojected (similar to cast in mtg), so that goes back on the thread (stack) and resolves (enters) again.

this resets any stat reductions, and once per turn effect limitations because it is a new card. you can effectively double the effect output and heal it.

this can be used to move a card outside of the opponents effect reach, or move a card into your effect reach.

these green cards, "frens", are projected (similar to mtg cast) by combining cards you already control (similar to yugioh's sacrifice mechanic), merging their stats and effects into a single card.

they have what is effectively summoning sickness ("autism") when you do this because the resulting card is generally very powerful. otherwise there is no general summoning sickness.