Kefka is a delirium commander that has a nice big activated ability
Until end of turn, it gains hexproof, reach, and "Whenever this creature becomes tapped, it deals damage equal to its power to up to one target creature." Players still get priority while a spell with split second is on the stack
One booster pack contains 12 random cards
Elesh Norn, Mother of Machines Jin-Gitaxias, Progress Tyrant Sheoldred, the Apocalypse Urabrask, Heretic Praetor Vorinclex, Monstrous Raider Ebon Praetor The mode is chosen randomly as this spell is put onto the stack but before it resolves
Magic is dead. The same thing happened with the energy counters from Kaladesh , the double-faced cards from Innistrad , phyrexian mana, planeswalkers, border changes, the introduction of Standard, and even the introduction of the 60-card deck limit
You get lots of control over which sagas go away and which abilities you repeat