Midnight Guard

Whenever another creature enters, untap Midnight Guard.

Snow-Covered Plains

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

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

Counter target spell unless its controller pays {1}.

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

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

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 a creature card, reveal it, then shuffle and put the card on top.

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

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

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

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

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

Whenever another creature enters, you may gain 1 life.

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