Training Center

This land enters tapped unless you have two or more opponents.
{T}: Add {U} or {R}.

Breeding Pool

({T}: Add {G} or {U}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

This land enters tapped unless you have two or more opponents.
{T}: Add {G} or {U}.

{T}, Pay 1 life: Add one mana of any color.

({T}: Add {G}, {U}, or {R}.)
This land enters tapped.
Cycling {3} ({3}, Discard this card: Draw a card.)

({T}: Add {R} or {G}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.

Each land is a Forest in addition to its other land types.

Whenever this land becomes tapped, it deals 1 damage to you.
{T}: Add one mana of any color.

({T}: Add {U} or {R}.)
As this land enters, you may pay 2 life. If you don't, it enters tapped.