Urza's Power Plant

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

Ashnod's Altar

Sol Ring

Disenchant

Ornithopter

Shield Sphere

Defender
Whenever this creature blocks, put a -0/-1 counter on it.

Plains

Enduring Renewal

Play with your hand revealed.
If you would draw a card, reveal the top card of your library instead. If it's a creature card, put it into your graveyard. Otherwise, draw a card.
Whenever a creature is put into your graveyard from the battlefield, return it to your hand.

Balance

Each player chooses a number of lands they control equal to the number of lands controlled by the player who controls the fewest, then sacrifices the rest. Players discard cards and sacrifice creatures the same way.

Urza's Tower

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

Swords to Plowshares

Exile target creature. Its controller gains life equal to its power.

Urza's Mine

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

Rocket Launcher

{2}: This artifact deals 1 damage to any target. Destroy this artifact at the beginning of the next end step. Activate only if you've controlled this artifact continuously since the beginning of your most recent turn.