An invisible ink card is a special variant of the regular version, that basically looks the same, but is exclusively foil and has extra in-universe text from the investigative crew taking notes about the character
Avacyn can help protect your host of creatures from certain doom with just a Cloudshift (or Restoration Angel)
The bad part is you need someone to kill it for you, so it's best played with sacrifice or flicker effects
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But a storm spell like Grapeshot or Brain Freeze offers a relatively cheap, immediate kill against any number of opponents, through most countermagic, potentially at instant speed, and without needing to rely on the vagaries of creature combat
Archwing Dragon ( F, ETB ) - 3 mana 4/4 haste is great, and can trigger Dragon Tempest or Scourge of Valkas multiple times