The new keyword ability reconfigure allows such an Equipment creature to become attached to another creature, move from creature to creature, or become unattached and become a creature itself again. It's everything equip can do, plus the added flexibility of not having to wait around for another creature to be effective on the battlefield.

Compleation is the process by which one becomes Phyrexian, almost certainly unwillingly, and the Praetors have finally discovered a way to compleat planeswalkers. Tamiyo, Compleated Sage debuts the compleated keyword ability along with a new hybrid Phyrexian mana symbol. Paying life for that symbol allows you cast Tamiyo perhaps a turn sooner, but she'll enter with two fewer loyalty counters.

Channel is an ability word that appears on cards which can be discarded from your hand for a special effect. Each of those cards has an activated ability which includes discarding that card as part of its cost.

Ninjutsu is a mechanic that allows your creatures to appear on the battlefield in a puff of smoke* when your opponent least expects it. If an attacking creature you control goes unblocked, you can reveal a card with ninjutsu from your hand, pay the ninjutsu cost, and return that attacking creature to its owner's hand. If you do, put the creature with ninjutsu onto the battlefield tapped and attacking.