Oath of Teferi is obviously the most powerful, but dont overlook Oath of Jace or Oath of Gideon
If you can survive the turn used to play this, you should have enough in hand to fill your board again
Watch Out for Fakes Value attracts counterfeits, and the 1999 Base Set Charizard is the single most faked Pokmon card, so a "valuable" old card is worth nothing if it is fake
The number after annihilator tells you how many permanents the defending player will have to sacrifice as that ability resolves
The gap between "market price" and "alt art price" matters here: if you're chasing the SEC leaders as collector pieces rather than playable cards, the alternate art prints are the ones actually holding a premium
Leaf is especially useful if you have an ex card in your active spot but can't afford for it to be potentially KO'd, as many of them have at least a two-retreat cost