Trample, firebending 4, haste
If you would lose unspent mana, that mana becomes red instead.
Ozai has flying and indestructible as long as you have six or more unspent mana.

Trample
Whenever you tap a land for mana, add one mana of any type that land produced.
Whenever an opponent taps a land for mana, that land doesn't untap during its controller's next untap step.

: Search your library for an enchantment card and reveal that card. Put it into your hand, then discard a card at random. Then shuffle.
: Search your library for an instant card and reveal that card. Put it into your hand, then discard a card at random. Then shuffle.

When this creature enters, you may search your library for an Equipment card, reveal it, put it into your hand, then shuffle.
, : You may put an Equipment card from your hand onto the battlefield.

, Sacrifice this artifact: Add one mana of any color.

All creatures have haste.

(: Add .)

Flying, protection from creatures

Buyback—Discard two cards. (You may discard two cards in addition to any other costs as you cast this spell. If you do, put this card into your hand as it resolves.)
Counter target spell.

You may spend mana as though it were mana of any color to activate abilities of creatures you control.
Creatures you control with +1/+1 counters on them have all activated abilities of all creature cards exiled with Agatha's Soul Cauldron.
: Exile target card from a graveyard. When a creature card is exiled this way, put a +1/+1 counter on target creature you control.

Each creature with mana value X or less loses all abilities until end of turn. Destroy those creatures.

At the beginning of your upkeep, sacrifice this creature unless you discard a card.
: This creature deals 1 damage to target creature.
: Regenerate this creature.

Add .

Indestructible
As long as your devotion to white and black is less than seven, Athreos isn't a creature.
Whenever another creature you own dies, return it to your hand unless target opponent pays 3 life.

Ninjutsu (, Return an unblocked attacker you control to hand: Put this card onto the battlefield from your hand tapped and attacking.)
Whenever this creature deals combat damage to a player, you may return target creature that player controls to its owner's hand.

(: Add , , or .)
This land enters tapped.
Cycling (, Discard this card: Draw a card.)

You may play up to three additional lands this turn.

You may spend mana as though it were mana of any color.
: Add .
, : Draw a card for each color among permanents you control.

Whenever you tap a nonland permanent for mana, add one mana of any type that permanent produced.
: Look at the top five cards of your library. You may put a non-Human creature card from among them onto the battlefield. Put the rest on the bottom of your library in a random order.

Flying
When this creature enters, draw a card.
As long as you have one or fewer cards in hand, if you would draw one or more cards, you draw that many cards plus one instead.
Warp