{T}: Add {C}. Spend this mana only to activate an ability or cast an artifact spell.

Changeling (This card is every creature type.) As this creature enters, choose a creature type. Whenever another creature you control of the chosen type enters, put a +1/+1 counter on this creature.

Whenever you get one or more {E} (energy counters), put a +1/+1 counter on target creature you control. {4}, {T}: You get {E}.

This creature enters with a +1/+1 counter on it. When this creature dies, if it had counters on it, put those counters on target creature you control.

Casualty 1 (As you cast this spell, you may sacrifice a creature with power 1 or greater. When you do, copy this spell.) Look at the top two cards of your library. Put one of them into your hand and the other on the bottom of your library.

Draw two cards. If you control no artifacts, discard a card.

{T}, Sacrifice an artifact: Draw a card.

When this land enters, surveil 1. (Look at the top card of your library. You may put it into your graveyard.) {T}: Add {C}. {1}, {T}: Add one mana of any color.

{T}: Add {C}. {1}, {T}: Put a storage counter on this land. {T}, Remove any number of storage counters from this land: Add {C} for each storage counter removed this way.

This land enters tapped. {T}: Add {C}. ({C} represents colorless mana.) {T}: Put a +1/+1 counter on target colorless creature that entered this turn.

When this creature enters, you may search your library for an artifact card with mana value 3, reveal it, put it into your hand, then shuffle.

Improvise (Your artifacts can help cast this spell. Each artifact you tap after you're done activating mana abilities pays for {1}.) Search your library for an artifact card with mana value X or less, put it onto the battlefield, then shuffle.