Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.
{U}{U}
Counterspell
Instant
Counter target spell.
{B}
Dark Ritual
Instant
Add {B}{B}{B}.
{U}
Delver of Secrets
Creature - Human Wizard
At the beginning of your upkeep, look at the top card of your library. You may reveal that card. If an instant or sorcery card is revealed this way, transform Delver of Secrets.
1 /
1
--
Insectile Aberration
Creature - Human Insect
Flying
1 /
1
{6}{U}{U}
Dig Through Time
Instant
Delve (Each card you exile from your graveyard while casting this spell pays for {1}.)
Look at the top seven cards of your library. Put two of them into your hand and the rest on the bottom of your library in any order.
{R}
Faithless Looting
Sorcery
Draw two cards, then discard two cards.
Flashback {2}{R} (You may cast this card from your graveyard for its flashback cost. Then exile it.)
--
Great Furnace
Artifact Land
{T}: Add {R}.
{B}{B}
Hymn to Tourach
Sorcery
Target player discards two cards at random.
{R}
Lightning Bolt
Instant
Lightning Bolt deals 3 damage to any target.
--
Seat of the Synod
Artifact Land
{T}: Add {U}.
{1}
Skullclamp
Artifact - Equipment
Equipped creature gets +1/-1.
Whenever equipped creature dies, draw two cards.
Equip {1}
{1}
Sol Ring
Artifact
{T}: Add {C}{C}.
--
Strip Mine
Land
{T}: Add {C}.
{T}, Sacrifice Strip Mine: Destroy target land.
{W}
Swords to Plowshares
Instant
Exile target creature. Its controller gains life equal to its power.
{2}{U}
Tinker
Sorcery
As an additional cost to cast this spell, sacrifice an artifact.
Search your library for an artifact card, put that card onto the battlefield, then shuffle.