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As an additional cost to cast this spell, return a creature you control to its owner's hand.
Counter target spell.

Menace
Whenever you gain life, put a +1/+1 counter on Blood Researcher.

When Ghost Council of Orzhova enters the battlefield, target opponent loses 1 life and you gain 1 life.
{1}, Sacrifice a creature: Exile Ghost Council of Orzhova. Return it to the battlefield under its owner's control at the beginning of the next end step.

Reach
Whenever another creature enters the battlefield under your control, you may pay {2}. When you do, that creature deals damage equal to its power to target creature.
Partner

Exile target creature an opponent controls. That player reveals cards from the top of their library until a creature card is revealed. The player puts that card onto the battlefield, then shuffles the rest into their library.
Rebound

Search your library for up to four creature cards with different powers and reveal them. An opponent chooses two of those cards. Shuffle the chosen cards into your library and put the rest into your hand.

Return X target outlaw creature cards from your graveyard to the battlefield.

Whenever you crank Gnomeball Machine, create two 1/1 colorless Gnome artifact creature tokens.

Equipped creature gets +2/+0, has vigilance, and is a Knight in addition to its other types.
Whenever equipped creature attacks, create a 2/2 white Knight creature token with vigilance that's attacking.
Equip {3}

{1}{G}, {T}, Discard a card: Search your library for a basic land card, put that card onto the battlefield tapped, then shuffle.

Bestow {5}{W}
Double strike
Enchanted creature gets +1/+1 and has double strike.

Whenever a Samurai or Warrior you control attacks alone, it gains lifelink until end of turn.
Sacrifice Selfless Samurai: Another target creature you control gains indestructible until end of turn.

Spectacle {B}{R}
{B}: Hackrobat gains deathtouch until end of turn.
{R}: Hackrobat gets +2/-2 until end of turn.

Destroy target nonblack creature. You gain 3 life.

Haste
Echo {2}{R}{R}
When Keldon Champion enters the battlefield, it deals 3 damage to target player or planeswalker.

[+1]: Choose up to one target artifact, up to one target creature, and up to one target land. Untap the chosen permanents you control. Tap the chosen permanents you don't control. You gain 2 life.
[–2]: Look at the top three cards of your library. Put one of them into your hand and the rest on the bottom of your library in any order.
[–7]: You get an emblem with "Untap all permanents you control during each opponent's untap step" and "You draw a card during each opponent's draw step."

Whenever Bloodmist Infiltrator attacks, you may sacrifice another creature. If you do, Bloodmist Infiltrator can't be blocked this turn.

Spree
+ {1} — Untap all creatures target player controls.
+ {1} — Target creature gains double strike until end of turn.

Devour 2
At the beginning of your upkeep, create a 1/1 green Saproling creature token for each +1/+1 counter on Mycoloth.

Smiting Helix deals 3 damage to any target and you gain 3 life.
Flashback {R}{W}

Enchant creature
Pay 2 life: Regenerate enchanted creature.

Target creature gets -3/-3 until end of turn. If you control a creature with power 4 or greater, you may return up to one target creature card from your graveyard to your hand.

{T}: Add {C}.
{T}: Add {W} or {U}. Adarkar Wastes deals 1 damage to you.

Flying
Whenever you cast an enchantment spell, put a +1/+1 counter on each creature you control.

Each creature you control can block an additional creature each combat.