Barad-dûr enters tapped unless you control a legendary creature.
: Add .
, : Amass Orcs X. Activate only if a creature died this turn.

First strike, menace
Whenever you cast your first instant or sorcery spell each turn, you may cast a spell with lesser mana value that shares a card type with it from your hand without paying its mana cost. If you don't, create First Mate Ragavan, a legendary 2/1 red Monkey Pirate creature token. It gains haste until end of turn.

Instant and sorcery spells you cast cost less to cast.
Whenever a spell or ability you control counters a spell, you may draw a card. If you do, discard a card.

Return up to three target artifacts and/or creatures to their owners' hands.
You may cast a spell with mana value 4 or less from your hand without paying its mana cost.

History Teacher — Sagas you control have read ahead.
Doctor's companion (You can have two commanders if the other is the Doctor.)

Discard a card at random: This creature gets +2/+2 until end of turn unless a player has this creature deal 4 damage to them. Activate only once each turn.

(Gain the next level as a sorcery to add its ability.)
If you would roll one or more dice, instead roll that many dice plus one and ignore the lowest roll.
: Level 2
Whenever you roll one or more dice, target creature you control gets +2/+0 and gains menace until end of turn.
: Level 3
Creatures you control have haste.

, : Choose a land type. Target creature you control gains snow landwalk of the chosen type until end of turn. Return that creature to its owner's hand at the beginning of the next end step.

, Sacrifice this creature: It deals 2 damage to target creature.

When you control no Swamps, sacrifice this creature.

, Sacrifice this creature: Destroy target land.

: Add . This land deals 1 damage to you.
Threshold — , , Sacrifice this land: It deals 2 damage to any target. Activate only if there are seven or more cards in your graveyard.

For Mirrodin!
Equipped creature gets +1/-1.
Equip

Equipped creature gets +4/-1.
Equip

Flash
When this Equipment enters, attach it to target creature you control. That creature gains wither until end of turn.
Equipped creature gets +1/+2.
Equip

Enchant land
Enchanted land has ": This land deals 1 damage to any target."

Whenever a creature attacks you, it loses flanking until end of turn.
Whenever a creature without flying attacks you, this enchantment deals 1 damage to it.

Choose one —
• Barbed Lightning deals 3 damage to target creature.
• Barbed Lightning deals 3 damage to target player or planeswalker.
Entwine

Indestructible
When this creature enters, suspect it.
Whenever this creature deals combat damage to a player, you draw a card and you lose 1 life.
Whenever this creature is dealt damage, target opponent loses that much life.

, , Sacrifice this artifact: Add one mana of any color. Draw a card at the beginning of the next turn's upkeep.

Trample, haste
Whenever this creature deals damage to a player, that player discards all the cards in their hand, then draws that many cards.

All Sliver creatures have ": This creature gets +1/+0 until end of turn."

When this Equipment enters, create a 1/1 colorless Thopter artifact creature token with flying, then attach this Equipment to it.
Equipped creature gets +1/+0.
Equip

At the beginning of each player's upkeep, this artifact deals 1 damage to that player.
: Prevent the next 1 damage that would be dealt by this artifact this turn.

: Target green creature blocking this creature gets -1/-1 until end of turn.