Cavern of Souls

As Cavern of Souls enters the battlefield, choose a creature type. {T}: Add {1} to your mana pool. {T}: Add one mana of any color to your mana pool. Spend this mana only to cast a creature spell of the chosen type, and that spell can't be countered.

Eiganjo Castle

{T}: Add {W} to your mana pool. {W}, {T}: Prevent the next 2 damage that would be dealt to target legendary creature this turn.

Thalia, Guardian of Thraben

First strike Noncreature spells cost {1} more to cast.

Chalice of the Void

Chalice of the Void enters the battlefield with X charge counters on it. Whenever a player casts a spell with converted mana cost equal to the number of charge counters on Chalice of the Void, counter that spell.

Simian Spirit Guide

Remove Simian Spirit Guide in your hand from the game: Add {R} to your mana pool.

Dismember

({B/P} can be paid with either {B} or 2 life.) Target creature gets -5/-5 until end of turn.

Rest in Peace

When Rest in Peace enters the battlefield, exile all cards from all graveyards. If a card or token would be put into a graveyard from anywhere, exile it instead.

Eldrazi Temple

{T}: Add {1} to your mana pool. {T}: Add {2} to your mana pool. Spend this mana only to cast colorless Eldrazi spells or activate abilities of colorless Eldrazi.

Leonin Arbiter

Players can't search libraries. Any player may pay {2} for that player to ignore this effect until end of turn.

Battlefield Forge

{T}: Add {1} to your mana pool. {T}: Add {R} or {W} to your mana pool. Battlefield Forge deals 1 damage to you.

Gemstone Caverns

If Gemstone Caverns is in your opening hand and you're not playing first, you may begin the game with Gemstone Caverns in play with a luck counter on it. If you do, remove a card in your hand from the game. {T}: Add {1} to your mana pool. If Gemstone Caverns has a luck counter on it, instead add one mana of any color to your mana pool.

Worship

Damage that would reduce your life total to less than 1 instead reduces it to 1 if you control a creature.

Ghost Quarter

Eldrazi Displacer

Matter Reshaper

Reality Smasher

Thought-Knot Seer

Horizon Canopy

Thalia, Heretic Cathar

Plains

({T}: Add {W}.)