Urza's Tower

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

Mana Tithe

Counter target spell unless its controller pays {1}.

Defender
{T}: Creatures you control gain haste until end of turn.

{T}, Sacrifice a creature: Blasting Station deals 1 damage to any target.
Whenever a creature enters, you may untap Blasting Station.

Search your library for up to two creature cards with different names, reveal them, put them into your hand, then shuffle.

Search your library for an enchantment card, reveal it, put it into your hand, then shuffle.

Whenever another creature enters, you may gain 1 life.

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

Reach
When Arboreal Grazer enters, you may put a land card from your hand onto the battlefield tapped.

Enchant creature
Enchanted creature has "{T}: Create a 1/1 green Elf Warrior creature token."

Whenever another creature enters, untap Midnight Guard.

Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Search your library for a creature card, reveal it, then shuffle and put the card on top.

Search your library for a Plains, Island, Swamp, or Mountain card, put it onto the battlefield tapped, then shuffle.

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