Search for the Frozen Esper I could see getting blown out by Nature's Claim on White Auracite, but feeding your opponent 4 life is a decently big drawback
Nazahn, Revered Bladesmith Nazahn, Revered Bladesmith provides a decent tutor that becomes quite impressive as long as you have Hammer of Nazahn in your librarywhich you often will, in EDH
One of Mark Rosewater's intentional design points for infect was that poisonous counters should not be removable
If not, we always have EDH
Both are legendary in more than name, with The Masamune giving first strike when attacking and forcing a foe to block, while also giving double triggers for creatures dying
Thanks to affinity for artifacts, it often costs less than 4 mana, especially in lists packed with cheap artifacts like Ichor Wellspring or Chromatic Star