opponent discards a card mtg What are the best cards with triggers when an card? Quest for the Nihil Stone

This could easily be a mono-red dragon commander, and there are interesting synergies to be had by cheating specific dragons into play, like using Balefire Dragon to kill some enemy creatures or Hellkite Tyrant to steal artifacts

Plus, Commander was designed as a multiplayer format

Card Set(s) -Absolute Justice- [ST-06] CARD VIEW ST06-006 | C | CHARACTER Tashigi Attribute Slash Block icon 1 Effect [Activate: Main] You may rest this Character: Give up to 1 of your opponent's Characters 2 cost during this turn

Direct damage and efficient threats shine without Blues contemplative approach

The card is a part of an infinite combo in Modern that involves cards like Grist, the Hunger Tide and undying creatures