At the beginning of your upkeep, each player loses 1 life. Put a +1/+1 counter on Blood Tyrant for each 1 life lost this way.
Whenever a player loses the game, put five +1/+1 counters on Blood Tyrant.
5 /
5
{2}{B}
Bloodflow Connoisseur
Creature - Vampire
Sacrifice a creature: Put a +1/+1 counter on Bloodflow Connoisseur.
1 /
1
{3}{B}
Bloodtracker
Creature - Vampire Wizard
Flying
{B}, Pay 2 life: Put a +1/+1 counter on Bloodtracker.
When Bloodtracker leaves the battlefield, draw a card for each +1/+1 counter on it.
2 /
2
{1}{B}
Brine Shaman
Creature - Human Cleric Shaman
{T}, Sacrifice a creature: Target creature gets +2/+2 until end of turn.
{1}{U}{U}, Sacrifice a creature: Counter target creature spell.
1 /
1
{2}{U}
Chasm Skulker
Creature - Squid Horror
Whenever you draw a card, put a +1/+1 counter on Chasm Skulker.
When Chasm Skulker dies, create X 1/1 blue Squid creature tokens with islandwalk, where X is the number of +1/+1 counters on Chasm Skulker. (They can't be blocked as long as defending player controls an Island.)
1 /
1
{U}
Cursecatcher
Creature - Merfolk Wizard
Sacrifice Cursecatcher: Counter target instant or sorcery spell unless its controller pays {1}.
1 /
1
{2}{U}{U}
Cytoplast Manipulator
Creature - Human Wizard Mutant
Graft 2 (This creature enters the battlefield with two +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)
{U}, {T}: Gain control of target creature with a +1/+1 counter on it for as long as Cytoplast Manipulator remains on the battlefield.
Whenever another creature dies, you may put a +1/+1 counter on Deathbringer Thoctar.
Remove a +1/+1 counter from Deathbringer Thoctar: It deals 1 damage to any target.
3 /
3
{3}{B}
Disciple of Bolas
Creature - Human Wizard
When Disciple of Bolas enters the battlefield, sacrifice another creature. You gain X life and draw X cards, where X is that creature's power.
2 /
1
{1}{B}{B}
Drana, Liberator of Malakir
Legendary Creature - Vampire Ally
Flying, first strike
Whenever Drana, Liberator of Malakir deals combat damage to a player, put a +1/+1 counter on each attacking creature you control.
2 /
3
{B}{R}
Dreadhorde Butcher
Creature - Zombie Warrior
Haste
Whenever Dreadhorde Butcher deals combat damage to a player or planeswalker, put a +1/+1 counter on Dreadhorde Butcher.
When Dreadhorde Butcher dies, it deals damage equal to its power to any target.
1 /
1
{2}{B}{R}
Exava, Rakdos Blood Witch
Legendary Creature - Human Cleric
First strike, haste
Unleash (You may have this creature enter the battlefield with a +1/+1 counter on it. It can't block as long as it has a +1/+1 counter on it.)
Each other creature you control with a +1/+1 counter on it has haste.
3 /
3
{2}{B}{R}
Falkenrath Aristocrat
Creature - Vampire Noble
Flying, haste
Sacrifice a creature: Falkenrath Aristocrat gains indestructible until end of turn. If the sacrificed creature was a Human, put a +1/+1 counter on Falkenrath Aristocrat.
4 /
1
{1}{R}
Falkenrath Exterminator
Creature - Vampire Archer
Whenever Falkenrath Exterminator deals combat damage to a player, put a +1/+1 counter on it.
{2}{R}: Falkenrath Exterminator deals damage to target creature equal to the number of +1/+1 counters on Falkenrath Exterminator.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
2 /
2
{3}{U}{U}
Glyph Keeper
Creature - Sphinx
Flying
Whenever Glyph Keeper becomes the target of a spell or ability for the first time each turn, counter that spell or ability.
Embalm {5}{U}{U} ({5}{U}{U}, Exile this card from your graveyard: Create a token that's a copy of it, except it's a white Zombie Sphinx with no mana cost. Embalm only as a sorcery.)
5 /
3
{4}{U}
Helium Squirter
Creature - Beast Mutant
Graft 3 (This creature enters the battlefield with three +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)
{1}: Target creature with a +1/+1 counter on it gains flying until end of turn.
0 /
0
{1}{B}{R}
Judith, the Scourge Diva
Legendary Creature - Human Shaman
Other creatures you control get +1/+0.
Whenever a nontoken creature you control dies, Judith, the Scourge Diva deals 1 damage to any target.
2 /
2
{5}{B}{R}
Kaervek the Merciless
Legendary Creature - Human Shaman
Whenever an opponent casts a spell, Kaervek the Merciless deals damage equal to that spell's mana value to any target.
5 /
4
{2}{B}
Midnight Reaper
Creature - Zombie Knight
Whenever a nontoken creature you control dies, Midnight Reaper deals 1 damage to you and you draw a card.
3 /
2
{3}{B}{B}{B}
Necropolis Regent
Creature - Vampire
Flying
Whenever a creature you control deals combat damage to a player, put that many +1/+1 counters on it.
6 /
5
{4}{U}{U}
Novijen Sages
Creature - Human Advisor Mutant
Graft 4 (This creature enters the battlefield with four +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)
{1}, Remove two +1/+1 counters from among creatures you control: Draw a card.
0 /
0
{1}{B}{R}
Olivia, Mobilized for War
Legendary Creature - Vampire Knight
Flying
Whenever another creature enters the battlefield under your control, you may discard a card. If you do, put a +1/+1 counter on that creature, it gains haste until end of turn, and it becomes a Vampire in addition to its other types.
3 /
3
{2}
Phyrexian Revoker
Artifact Creature - Phyrexian Horror
As Phyrexian Revoker enters the battlefield, choose a nonland card name.
Activated abilities of sources with the chosen name can't be activated.
2 /
1
{3}{U}{U}
River Kelpie
Creature - Beast
Whenever River Kelpie or another permanent enters the battlefield from a graveyard, draw a card.
Whenever a player casts a spell from a graveyard, draw a card.
Persist (When this creature dies, if it had no -1/-1 counters on it, return it to the battlefield under its owner's control with a -1/-1 counter on it.)
3 /
3
{2}{U}
Sage of Fables
Creature - Merfolk Wizard
Each other Wizard creature you control enters the battlefield with an additional +1/+1 counter on it.
{2}, Remove a +1/+1 counter from a creature you control: Draw a card.
2 /
2
{U}
Siren Stormtamer
Creature - Siren Pirate Wizard
Flying
{U}, Sacrifice Siren Stormtamer: Counter target spell or ability that targets you or a creature you control.
1 /
1
{U/B}{U/B}
Sygg, River Cutthroat
Legendary Creature - Merfolk Rogue
At the beginning of each end step, if an opponent lost 3 or more life this turn, you may draw a card. (Damage causes loss of life.)
1 /
3
{6}
Triskelion
Artifact Creature - Construct
Triskelion enters the battlefield with three +1/+1 counters on it.
Remove a +1/+1 counter from Triskelion: It deals 1 damage to any target.
1 /
1
{2}{U}{U}
Venser, Shaper Savant
Legendary Creature - Human Wizard
Flash
When Venser, Shaper Savant enters the battlefield, return target spell or permanent to its owner's hand.
2 /
2
{2}{U}
Vigean Graftmage
Creature - Vedalken Wizard Mutant
Graft 2 (This creature enters the battlefield with two +1/+1 counters on it. Whenever another creature enters the battlefield, you may move a +1/+1 counter from this creature onto it.)
{1}{U}: Untap target creature with a +1/+1 counter on it.
0 /
0
{U}{U}
Voidmage Prodigy
Creature - Human Wizard
{U}{U}, Sacrifice a Wizard: Counter target spell.
Morph {U} (You may cast this card face down as a 2/2 creature for {3}. Turn it face up any time for its morph cost.)
2 /
1
{2}{B}
Yahenni, Undying Partisan
Legendary Creature - Aetherborn Vampire
Haste
Whenever a creature an opponent controls dies, put a +1/+1 counter on Yahenni, Undying Partisan.
Sacrifice another creature: Yahenni gains indestructible until end of turn.