Peer into the Abyss

Target player draws cards equal to half the number of cards in their library and loses half their life. Round up each time.

Brainstorm

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

{T}, Pay 1 life, Sacrifice Polluted Delta: Search your library for an Island or Swamp card, put it onto the battlefield, then shuffle.

Exile Elvish Spirit Guide from your hand: Add {G}.

Draw four cards. You skip your next turn.

Look at the top three cards of your library, then put them back in any order. You may shuffle.
Draw a card.

Draw four cards. You lose half your life, rounded up.

Target player draws X cards and loses X life.

Exile a card from your hand: Add {B}{B} or {G}{G}.

{T}, Pay 1 life, Sacrifice Misty Rainforest: Search your library for a Forest or Island card, put it onto the battlefield, then shuffle.

{T}, Pay 1 life, Sacrifice Verdant Catacombs: Search your library for a Swamp or Forest card, put it onto the battlefield, then shuffle.