As this artifact enters, choose a color.
Creatures you control of the chosen color get +1/+1.
Whenever a land's ability causes you to add one or more mana of the chosen color, add an additional one mana of that color.

Menace
When this creature enters, target opponent reveals their hand. You choose a nonland card from it. That player discards that card.
Evoke—Exile a black card from your hand.

: Add one mana of any color.
, : Up to X target creatures you control each gain haste until end of turn and can't be blocked this turn except by creatures with haste, where X is the number of Bobbleheads you control as you activate this ability.

At the beginning of combat on your turn, create a token that's a copy of equipped creature, except the token isn't legendary. That token gains haste.
Equip

Each player shuffles their hand and graveyard into their library, then draws seven cards.
Flashback (You may cast this card from your graveyard for its flashback cost. Then exile it.)

Flying, hexproof from multicolored
Whenever Niv-Mizzet deals combat damage to a player, it deals X damage to any target, target player draws X cards, and you gain X life, where X is the number of different color pairs among permanents you control that are exactly two colors.

Partner with Owen Grady, Raptor Trainer (When this creature enters, target player may put Owen into their hand from their library, then shuffle.)
For each kind of counter on Blue, Loyal Raptor, each other Dinosaur you control enters with a counter of that kind on it.

, Sacrifice this artifact: Add three mana of any one color. Spend this mana only to cast your commander.

Lightning Bolt deals 3 damage to any target.

Lightning Bolt deals 3 damage to any target.

Flash
Flying
When Aang enters, airbend up to one other target creature or spell. (Exile it. While it's exiled, its owner may cast it for rather than its mana cost.)
Waterbend : Transform Aang.

As long as this creature is untapped, noncreature artifacts you control can't be enchanted, they have indestructible, and other players can't gain control of them. This effect doesn't remove Auras already attached to those artifacts.

Search your library for a card, then shuffle and put that card on top. You lose 2 life.

Companion — Each permanent card in your starting deck has an activated ability. (If this card is your chosen companion, you may put it into your hand from outside the game for as a sorcery.)
Abilities you activate that aren't mana abilities cost less to activate. This effect can't reduce the mana in that cost to less than one mana.
, : Target creature can't block this turn.

: Add .

Indestructible
When The One Ring enters, if you cast it, you gain protection from everything until your next turn.
At the beginning of your upkeep, you lose 1 life for each burden counter on The One Ring.
: Put a burden counter on The One Ring, then draw a card for each burden counter on The One Ring.

When this creature is put into your graveyard from the battlefield, you may return it to your hand.

(: Add or .)

Flash
At the beginning of your end step, draw seven cards.
Each opponent's maximum hand size is reduced by seven.

Red creatures get +1/+1.
Whenever a Mountain is tapped for mana, its controller adds an additional .