Playing cards at instant speed like counter magic or things with flash can work really well here if you dedicate the deck to doing it
This makes it almost impossible to kill before attaining a slow but inevitable victory
Discard this card when the site is discarded or returned to its location deck
This trend continued with Portal Three Kingdoms, which was created for the Asian market as a retelling of the Three Kingdoms period of Chinese history
These will transform after you fulfill some kind of condition on the card, usually either an activated ability (i.e., paying to exile Terra, Magical Adept) or triggered ability (i.e., having six permanents in the yard for Exdeath, Void Warlock at end of turn)
Being able to draw cards off of this seems very easy, especially if you're using other means like Vedalken Shackles, Memnarch, or Blatant Thievery