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From $9.50
'Whenever an opponent taps a land for mana, tap all lands that player controls.
If a creature an opponent controls attacks, all creatures that opponent controls attack if able.
From $9.00
'Each spell costs {3} more to cast except during its controller's turn.
From $12.75
'Flying, first strike
Whenever a commander you control enters or attacks, proliferate. (Choose any number of permanents and/or players, then give each another counter of each kind already there.)
From $6.50
'This land enters tapped unless you control two or more other lands.
{T}: Add {B} or {G}.
From $12.75
'This land enters tapped unless you have two or more opponents.
{T}: Add {G} or {W}.
From $3.50
'Whenever an Aura you control enters, if you cast it, you may search your library for an Aura card with mana value less than or equal to that Aura and...
From $7.00
This land enters tapped.
{T}: Add {C}.
{T}: Add one mana of any color. Spend this mana only to cast artifact spells or activate abilities of artifacts.
Modular 1
From $47.75
'Whenever an opponent draws a card, that player may pay {2}. If the player doesn't, you create a Treasure token. (It's an artifact with "{T}, Sacrifice this token: Add one...
From $7.25
'{T}: Add {C}.
{T}, Sacrifice this land: Put your commander into your hand from the command zone.
From $8.75
'At the beginning of each end step, each opponent loses life equal to the life they lost this turn. (Damage causes loss of life.)
From $6.75
'As this enchantment enters, choose a creature type.
Creatures of the chosen type have fear. (They can't be blocked except by artifact creatures and/or black creatures.)
From $18.25
'Whenever an opponent taps a land for mana, tap all lands that player controls.
If a creature an opponent controls attacks, all creatures that opponent controls attack if able.