Tragic Lesson

Draw two cards. Then discard a card unless you return a land you control to its owner's hand.

Serum Visions

Whenever you draw a card, you may have target player mill a card.

Flash
Enchant creature
Enchanted creature gets -2/-0. It gets -6/-0 instead as long as its controller has seven or more cards in their graveyard.

Target player mills four cards. (Then exile this card. You may cast the creature later from exile.)

Counter target spell. Its controller mills three cards.

Flying
Jace's Phantasm gets +4/+4 as long as an opponent has ten or more cards in their graveyard.

Target player mills two cards.
Draw a card.

Return target creature to its owner's hand.

Draw three cards, then put two cards from your hand on top of your library in any order.