As long as equipped creature is tapped, tapped creatures you control get +2/+0.
As long as equipped creature is untapped, untapped creatures you control get +0/+2.
: You may tap or untap equipped creature.
Equip

Destroy each nonland permanent with mana value 2 or less. Add or for each permanent destroyed this way.

Whenever a player casts their first multicolored spell each turn, each other player draws a card.

Flying
Whenever you cast a Spirit or Arcane spell, destroy all permanents with that spell's mana value.

If Impatient Iguana is in your opening hand and you're not the starting player, you may reveal it. If you do, you become the starting player.
Haste

Flash
When this creature enters, choose one —
• Put a +1/+1 counter on this creature for each creature that left the battlefield under your control this turn.
• You gain 2 life and scry 2.
• Exile target player's graveyard.

Target player loses 2 life and you gain 2 life. Create two Blood tokens. (They're artifacts with ", , Discard a card, Sacrifice this token: Draw a card.")

Flash (You may cast this spell any time you could cast an instant.)
When Venser enters, return target spell or permanent to its owner's hand.

Offspring (You may pay an additional as you cast this spell. If you do, when this creature enters, create a 1/1 token copy of it.)
Landfall — Whenever a land you control enters, this creature deals 1 damage to target opponent.

First strike
When this creature enters, target opponent may have you draw three cards. If the player doesn't, you mill three cards, then this creature deals damage to that player equal to the total mana value of those cards.

At the beginning of your upkeep, put a time counter on this enchantment.
Once each turn, you may pay rather than pay the mana cost for a spell you cast with mana value X or less, where X is the number of time counters on this enchantment.

Hexproof
This land enters tapped. As it enters, choose a color.
: Add one mana of the chosen color.

Each player shuffles all permanents they own into their library, then reveals that many cards from the top of their library. Each player puts all artifact, creature, and land cards revealed this way onto the battlefield, then does the same for enchantment cards, then puts all cards revealed this way that weren't put onto the battlefield on the bottom of their library.

As this land enters, you may reveal an Island or Mountain card from your hand. If you don't, this land enters tapped.
: Add or .

: Add . If you control an Urza's Power-Plant and an Urza's Tower, add instead.

, Say your middle name: This creature gains shroud until end of turn.
, Say an opponent's middle name: This creature gains flying until end of turn.

Gain control of target spell. You may choose new targets for it. (If that spell becomes a permanent, it enters under your control.)

Until your next turn, all lands you control become 2/2 Elemental creatures with reach, indestructible, and haste. They're still lands.

Flying
Whenever Niv-Mizzet deals damage to a player, you may draw a card.
: Niv-Mizzet deals 1 damage to any target.

When you next cast an instant spell, cast a sorcery spell, or activate a loyalty ability this turn, copy that spell or ability twice. You may choose new targets for the copies.