Counters like Defabricate and Scatter Ray give Blue some good removal options to keep it in the game Blues also got some decent mana sinks in the set with Air Marshal, and Third Path Savant
You can get land with Eternal Dragon (and also have self-recursion with it as well), more discard with Ebon Dragon, tutor for things with Hoarding Dragon or Imperial Hellkite, sweeping with Steel Hellkite or Thunder Dragon or Scourge of Kher Ridges, take extra combat steps with Hellkite Charger, destroy artifacts with Hoard-Smelter Dragon, draw cards with Knollspine Dragon or Niv-Mizzet, lock creatures down with Rimescale Dragon, or combo out with Worldgorger Dragon
As Number Evallie's restriction only applies when the summoned monster is on the field, you could theoretically destroy this after its summon, let it resurrect itself, then continue doing your normal plays
Charge courageously into battle in a new world with the Pokmon TCG: Sword & ShieldAstral Radiance expansion