Ophiomancer

At the beginning of each upkeep, if you control no Snakes, create a 1/1 black Snake creature token with deathtouch.

Doppelgang

For each of X target permanents, create X tokens that are copies of that permanent.

Five Hundred Year Diary enters tapped.
{T}: Add {U} for each Clue you control.
{2}, Sacrifice Five Hundred Year Diary: Draw a card.

Hexproof
Whenever you cast a creature spell, note one of its creature types that hasn't been noted for this artifact.

You may play cards exiled with Tibalt, Cosmic Impostor, and you may spend mana as though it were mana of any color to cast those spells.

Haste (This creature can attack and {T} as soon as it comes under your control.)
{T}: Kamahl, Pit Fighter deals 3 damage to any target.

{T}: Add {C}.
{3}, {T}: Target creature with power 3 or less can't be blocked this turn.