Whenever you copy an instant or sorcery spell, you may pay {1}{U}. If you do, draw a card. Whenever you cast an instant or sorcery spell, you may pay {1}{R}. If you do, Unbound Researchers deals 2 damage to target player or planeswalker.
Whenever you cast another creature spell, create a 1/1 green and white Elk Spirit creature token. As long as you control five or more Elk, creatures you control get +3/+3 and have trample.
Noble is the forest's sovereign, and mighty are his people.
When Unburdening Priest enters, you may exile any number of creatures you control not named Unburdening Priest, then return those cards to the battlefield under your control.
Unceasing Flames deals X damage to any target, where X is 2 plus the number of cards named Unceasing Flames in your graveyard. Conjure three cards named Unceasing Flames and shuffle them into your main library.
When Uncovered Secrets enters, search your library for an artifact card, reveal that card, then shuffle and put that card on top. Concord — Creatures you control get +1/+1 as long as there are four or more card types among permanents you control.
Creature cards in your graveyard have revive {2}{B}{B}. ({2}{B}{B}, Exile this card from your graveyard: Create a token that's a copy of it except it has no mana cost. Revive only as a sorcery.)
At the beginning of each opponent's upkeep, that player may discard their hand. If the player does, sacrifice Under the Gun. Otherwise, put a bullet counter on Under the Gun, then that player loses life equal to the number of bullet counters on it.
Concord — As long as there are four or more card types among permanents you control, you may cast the first spell you cast each turn without paying its mana cost.
Flash If an opponent would draw a card, that player exiles the top card of their library instead. During each player's turn, that player may play that card for as long as it remains exiled.
“Oh but you do understand how things work around here, yes?”
Vigilance Whenever Underpass Sentinel enters or attacks, you may put a +1/+1 counter on another target creature you control without one. Sacrifice Underpass Sentinel: Embattled creatures you control gain hexproof and indestructible until end of turn. (A creature is embattled if it has a counter on it or a permanent you control attached to it.)
At the beginning of your upkeep, reveal the top card of your library. If it has the same name as a card in your graveyard, put the revealed card into your hand. Otherwise, put it into your graveyard.
Archive 0 (As this enters, shuffle the top zero cards of your main library into a new face up library. Sacrifice this after the archived library is empty.) As Undue's Study enters, shuffle your graveyard into the archived library.
The lich finds little interest in anything that hasn't died at least once.
[+2]: Exile up to three target cards from graveyards. [+1]: Create a 2/1 black Horse Zombie creature token with lifelink. [0]: If Undue has six or more loyalty counters on him, each opponent returns a creature card of their choice from a graveyard to the battlefield under your control.
When Undying Lich dies, create a 6/3 black Zombie Horror creature token with menace and “When this creature dies, create an 8/5 black Elder Demon Horror creature token with flying, deathtouch, and menace.”
Whenever a creature you control dies, you may return all cards that were inscribed onto that creature and all Auras that were attached to that creature to their owners' hands.
Create three 1/1 colorless Servo artifact creature tokens. Exile Unending Armies. At the beginning of your upkeep, if you have more life than each opponent, you may cast it without paying its mana cost. Otherwise, put it into your graveyard.
Enchant land When Unexplored Regions enters, draw a card. Enchanted land is an artifact in addition to its other types and has “{T}: Add one mana of any color.”
Even before the Kelian League, all of Akieva's disparate cities barely saw any of its beauties.
Whenever one or more creatures you control deal combat damage to a player, that player discards a card. Then that player may discard another card. If they don't, create two 2/1 black Nightmare creature tokens with “This creature can't block.” Fleeting {1}{B}{B}(You may cast this spell for its fleeting cost. If you do, sacrifice it at the beginning of the next end step.)
Search your library for a card, reveal it, then shuffle and put that card on top of it. If you revealed a noncreature card this way, each opponent loses 2 life and you gain 2 life.