If you can hold the board and power advantage, taking an extra combat phase may be enough to crush many opponents
Doduo can be obtained from Genetic Apex: Mewtwo, Genetic Apex: Charizard, and Genetic Apex: Pikachu packs in the Genetic Apex set
There's also what Wizards refers to internally as ' snap-on equipment .' This isn't a named mechanic, but rather refers to the type of equipment that automatically attaches to creatures once it enters the battlefield, like Embercleave or Mithril Coat
One of his effects is a primitive version of what would be known as 'goad' in future sets, which is to force one of your opponent's creatures to attack -- thereby making it susceptible to destruction by combat
Harbinger of the Seas turns all nonbasic lands into Islands, so say goodbye to all your mana fixing, while Winter Moon doesnt let anyone untap their nonbasic lands
Sylvan Library Speaking of multi-format staples, Sylvan Library can even make the cut in Vintage, besides being often seen in cEDH