Urza's Tower

{T}: Add {C}. If you control an Urza's Mine and an Urza's Power-Plant, add {C}{C}{C} instead.

Careful Study

{T}: Add {C}. If you control an Urza's Mine and an Urza's Tower, add {C}{C} instead.

{T}: Add {C}. If you control an Urza's Power-Plant and an Urza's Tower, add {C}{C} instead.

{T}: You may put a land card from your hand onto the battlefield.

Annihilator 2 (Whenever this creature attacks, defending player sacrifices two permanents.)
Ulamog's Crusher attacks each combat if able.

Draw three cards, then put two cards from your hand on top of your library in any order.

When you cast this spell, you may put a card an opponent owns from exile into that player's graveyard. If you do, you gain 5 life.

{T}: You may put a land card from your hand onto the battlefield. Activate only as a sorcery.

Draw a card. You may put a land card from your hand onto the battlefield.

You may play an additional land this turn.
Draw a card.

Destroy target artifact or enchantment. You may put a land card from your hand onto the battlefield.