Millikin

{T}, Mill a card: Add {C}. (To mill a card, put the top card of your library into your graveyard.)

Ark of Hunger

Whenever one or more cards leave your graveyard, this artifact deals 1 damage to each opponent and you gain 1 life.
{T}: Mill a card. You may play that card this turn.

Pearl Medallion

White spells you cast cost {1} less to cast.

Ruby Medallion

Red spells you cast cost {1} less to cast.

The Warring Triad

Flying, trample, haste
As long as there are fewer than eight cards in your graveyard, The Warring Triad isn't a creature.
{T}, Mill a card: Target player adds one mana of any color.

Dragon's Rage Channeler

Whenever you cast a noncreature spell, surveil 1. (Look at the top card of your library. You may put that card into your graveyard.)
Delirium — As long as there are four or more card types among cards in your graveyard, this creature gets +2/+2, has flying, and attacks each combat if able.

Pack a Punch

Mill a card. Put two +1/+1 counters on target creature. It gains trample until end of turn.

Kirol, History Buff

Whenever one or more cards leave your graveyard, Kirol becomes prepared. (While it's prepared, you may cast a copy of its spell. Doing so unprepares it.)

Kirol, History Buff // Pack a Punch

Lembas

When this artifact enters, scry 1, then draw a card.
{2}, {T}, Sacrifice this artifact: You gain 3 life.
When this artifact is put into a graveyard from the battlefield, its owner shuffles it into their library.

Yidaro, Wandering Monster

Trample, haste
Cycling {1}{R}
When you cycle this card, shuffle it into your library from your graveyard. If you've cycled a card named Yidaro, Wandering Monster four or more times this game, put it onto the battlefield from your graveyard instead. (Do this before you draw.)