I know some folks have experimented with B/R Heartless Summoning to play Inferno Titans quickly (turn 3 Titan using Priest of Urabrask, or turn 3 Urabrask into turn 4 hasty Titan)
In the past this used to be called Summoning Sickness. Hexproof : It cannot be targeted by opponents spells or abilities Over close to 3 decades of Magic history, there have been dozens, if not hundreds, of new abilities
Kiki-Jiki, Mirror Breaker Kiki-Jiki has haste, and it can create tokens with haste, too
It also shifted the way players approached deck building since its release
Engines that provide milling are also beneficial in the deck, such as the "Horus" cards with "The Zombie Vampire", or "Fiendsmith" for "Pilgrim Reaper"
This allows older printed versions of these same cards to be used in newer rotations