Library of Alexandria

{T}: Add {C}.
{T}: Draw a card. Activate only if you have exactly seven cards in hand.

Goblin King

Other Goblins get +1/+1 and have mountainwalk.

Fireball

This spell costs {1} more to cast for each target beyond the first.
Fireball deals X damage divided evenly, rounded down, among any number of targets.

Llanowar Elves

Dark Ritual

Manabarbs

Whenever a player taps a land for mana, Manabarbs deals 1 damage to that player.

Strip Mine

{T}: Add {C}.
{T}, Sacrifice Strip Mine: Destroy target land.

Sol Ring

Bazaar of Baghdad

{T}: Draw two cards, then discard three cards.

Time Walk

Demonic Tutor

Search your library for a card, put that card into your hand, then shuffle.