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When this creature specializes, you may sacrifice another creature or an artifact. If you do, untap Wyll of the Blade Pact. After this main phase, there is an additional combat phase followed by an additional main phase.

When this creature specializes, you may sacrifice another creature or an artifact. When you do, return target creature card from your graveyard to the battlefield. It gains haste. If its mana value is 4 or greater, sacrifice it at the beginning of your next end step.

When this creature specializes, you may sacrifice another creature or an artifact. When you do, return target instant or sorcery card from your graveyard to your hand.

When this creature specializes, you may sacrifice another creature or an artifact. If you do, Wyll of the Fey Pact perpetually gets +3/+3 and gains trample.

When this creature specializes, you may sacrifice another creature or an artifact. When you do, draw three cards unless target opponent pays 5 life.

Choose target spell or ability with one or more targets. Roll a d20 and add the greatest power among creatures you control.
1—14 | You may choose new targets for that spell or ability.
15+ | You may choose new targets for that spell or ability. Then copy it. You may choose new targets for the copy.

Specialize {2}
When Wyll, Pact-Bound Duelist enters the battlefield, gain control of target artifact or creature an opponent controls with mana value 4 or less until the end of your next turn.

At the beginning of your upkeep, choose target opponent. Until end of turn, that player can't cast spells, you may look at the top card of their library any time, you may play the top card of their library, and you may spend mana as though it were mana of any color to cast spells this way.

Casualty 2
Each opponent exiles the top card of their library. You may cast spells from among those cards this turn. If you cast a spell this way, pay life equal to that spell's mana value rather than pay its mana cost.

Xantcha, Sleeper Agent enters the battlefield under the control of an opponent of your choice.
Xantcha attacks each combat if able and can't attack its owner or planeswalkers its owner controls.
{3}: Xantcha's controller loses 2 life and you draw a card. Any player may activate this ability.

{5}: Until end of turn, Xanthic Statue becomes an 8/8 Golem artifact creature with trample.

Flying, trample
At the beginning of your upkeep, sacrifice a creature other than Xathrid Demon, then each opponent loses life equal to the sacrificed creature's power. If you can't sacrifice a creature, tap Xathrid Demon and you lose 7 life.

Deathtouch
{2}{B}, {T}: Put a petrification counter on target creature. It gains defender and becomes a colorless artifact in addition to its other types. Its activated abilities can't be activated.

Whenever Xathrid Necromancer or another Human creature you control dies, create a tapped 2/2 black Zombie creature token.

Hexproof
{3}{B}: Until end of turn, Xathrid Slyblade loses hexproof and gains first strike and deathtouch.

{T}, Remove a counter from another permanent you control: Populate. Activate only as a sorcery.
{T}, Sacrifice another creature: Proliferate. Activate only as a sorcery.

Indestructible
As long as your devotion to red and green is less than seven, Xenagos isn't a creature.
At the beginning of combat on your turn, another target creature you control gains haste and gets +X/+X until end of turn, where X is that creature's power.

[+1]: Add X mana in any combination of {R} and/or {G}, where X is the number of creatures you control.
[0]: Create a 2/2 red and green Satyr creature token with haste.
[–6]: Exile the top seven cards of your library. You may put any number of creature and/or land cards from among them onto the battlefield.

{T}: Until your next upkeep, target noncreature artifact becomes an artifact creature with power and toughness each equal to its mana value.

Double strike
Auras you control have exalted.

As Xenograft enters the battlefield, choose a creature type.
Each creature you control is the chosen type in addition to its other types.

Flying, vigilance
{T}: Create a 2/2 white and blue Knight creature token with vigilance. Activate only if you've cast two or more spells this turn.

Horsemanship
Sacrifice Xiahou Dun, the One-Eyed: Return target black card from your graveyard to your hand. Activate only during your turn, before attackers are declared.

Flying
{B}{R}{G}, {T}: Target player draws a card.

Flying, haste
Whenever Xira, the Golden Sting attacks, put an egg counter on another target creature without an egg counter on it. When that creature dies, if it has an egg counter on it, draw a card and create a 1/1 black Insect creature token with flying.