Pests don't seem to mesh well with Amonketh's lore (They are more Arcavios based) and speaking of, maybe replace it with Locus which is kinda more in tone with the Amonketh/and Biblical plagues.
Temporal Rewinder 2UR
Creature - Weird Wizard
Haste
Whenever you cast a spell from exile, you may tap or untap target permanent. T: Choose a card with suspend in your graveyard. You may suspend that card as thought it was in your hand this turn by paying its suspend cost. 3/2
Greet the Underwold 1B
Sorcery
Return target Legendary creature from your graveyard to the battlefield tapped, then create a Returned's Gift Aura token attached to that creature (Enchanted creature is a black Zombie Enchantment Creature in addition to its other types. If enchanted creature would die, exile it instead.)
- Erebos always welcomes new visitors with a gift they can't resist.
Returned's Gift
Token Enchantment — Aura
Enchant Creature
Enchanted creature is a black Zombie Enchantment Creature in addition to its other types.
If enchanted creature would die, exile it instead.
Rat, Sleeper Assassin UB
Legendary Creature - Human
Rat, Sleeper Assassin enters the battlefield under the control of an opponent of your choice with a Sleeper Agent Aura token attached to her.
Rat, Sleeper Assassin is an Assassin in addition to its other types and have Ward 2 as long as you control her.
Whenever Rat, Sleeper Assassin attacks its owner or planeswalkers its owner controls, destroy each Sleeper Agent Aura attached to her. 4/4
Sleeper Agent
Token Enchantment — Aura
Enchant Creature
When this card is destroyed, enchanted creature's controller sacrifices a creature they control other than enchanted creature, then enchanted creature's owner gains control of it.
Hero of Uncertainty 2
Creature - Human Knight
As an additional cost to cast Hero of Uncertainty you may pay WWW and/or BBB
Hero of Uncertainty as Flying as long as it is enchanted.
When Hero of Uncertainty enters the battlefield, create a Holy Destiny Aura token attached to it if WWW was paid to cast it, then create a Demonic Possession Aura token attached to it if BBB was paid to cast it. 2/2
Holy Destiny
Token Enchantment — Aura
Enchant Creature
Enchanted creature is an Angel in addition to its other types and has +1/+3, vigilance, lifelink and "At the beggining of your end step. If you gained 3 or more lifes this turn, you may draw a card".
Demonic Possession
Token Enchantment — Aura
Enchant Creature
Enchanted creature is a Demon in addition to its other types and has +3/+1, trample, haste and "At the beggining of your end step. Each opponent that have lost 3 or more lifes this turn discards a card.".
Heirloom Lich 2BB
Creature - Zombie Avatar
Indestructible
When Heirloom Lich enters the battlefield, you may create a Soul Binding Aura token attached to target artifact you control, then put a number of +1/+1 counters on Heirloom Lich equal to that artifact's mana value.
At the beggining of each upkeep sacrifice Heirloom Lich unless you control an enchantment named Soul Binding. 3/3
Soul Binding
Token Enchantment — Aura
Enchant Artifact
At the beginning of your upkeep you may remove two +1/+1 counters from permanents you control, if you do, you draw a card and lose 1 life. If you can't, sacrifice Soul Binding.
Soulstoke Phoenix 3RR
Creature - Phoenix
As you cast Soulstoke Phoenix choose a permanent of each type among nonland permanents you control, then create a Life Storage Aura token attached to each of those permanents.
Flying, haste. 3RR, Sacrifice a permanent you control enchanted with a Life Storage: Return Soulstoke Phoenix from your graveyard to the battlefield. 4/4
Life Storage
Token Enchantment — Aura
Enchant Permanent
When enchanted permanent is put into the graveyard, exile it instead. Until the end of your next you may cast that card.
Ishai, of the Frozen Winds 2WU
Legendary Creature - Bird Monk
Flying
When Ishai, of the Frozen Winds enters the battlefield, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
Spells you cast that share a color with one or more creatures with stun counters on them, cost 1 less to cast. 2/2
Questioning though, since the ability says another "nontoken creature" it would get errata that it must also be a nontoken copy of Voldaren Bloodcaster for the ability to trigger.
Whenever Voldaren Bloodcaster OR another nontoken creature you control dies, create a Blood token.
Means it triggers if any of the following happens:
1) Voldaren Bloodcaster itself dies (regarless if it is a token or not)
2) Voldaren Bloodcaster sees another nontoken creature dying
The card works as intended and need not to be errated
Your standard enchantress is an green and/or white card that draws a card when an enchantment enters the battlefield. Over in their shared enemy color black, their first attempt at an enchantress draws a card when those enchantress leave the battlefield for the graveyard instead.
Three card combo kinda invalidates concern. There are too many already to worry about that, and Wizards continues to release infinite 2 card combos in modern times. If it was just a two card combo, I think there's more cause for alarm.
Only one of those currently support combo also, since the condition was changed to "black creature card". Dracula, Lord of Blood will cease since it's nontoken.
It does triggers of itself dying, but yeah the change works.
Otherwise I really like the card
Creature - Weird Wizard
Haste
Whenever you cast a spell from exile, you may tap or untap target permanent.
T: Choose a card with suspend in your graveyard. You may suspend that card as thought it was in your hand this turn by paying its suspend cost.
3/2
Sorcery
Return target Legendary creature from your graveyard to the battlefield tapped, then create a Returned's Gift Aura token attached to that creature (Enchanted creature is a black Zombie Enchantment Creature in addition to its other types. If enchanted creature would die, exile it instead.)
- Erebos always welcomes new visitors with a gift they can't resist.
Rat, Sleeper Assassin UB
Legendary Creature - Human
Rat, Sleeper Assassin enters the battlefield under the control of an opponent of your choice with a Sleeper Agent Aura token attached to her.
Rat, Sleeper Assassin is an Assassin in addition to its other types and have Ward 2 as long as you control her.
Whenever Rat, Sleeper Assassin attacks its owner or planeswalkers its owner controls, destroy each Sleeper Agent Aura attached to her.
4/4
Hero of Uncertainty 2
Creature - Human Knight
As an additional cost to cast Hero of Uncertainty you may pay WWW and/or BBB
Hero of Uncertainty as Flying as long as it is enchanted.
When Hero of Uncertainty enters the battlefield, create a Holy Destiny Aura token attached to it if WWW was paid to cast it, then create a Demonic Possession Aura token attached to it if BBB was paid to cast it.
2/2
Heirloom Lich 2BB
Creature - Zombie Avatar
Indestructible
When Heirloom Lich enters the battlefield, you may create a Soul Binding Aura token attached to target artifact you control, then put a number of +1/+1 counters on Heirloom Lich equal to that artifact's mana value.
At the beggining of each upkeep sacrifice Heirloom Lich unless you control an enchantment named Soul Binding.
3/3
Soulstoke Phoenix 3RR
Creature - Phoenix
As you cast Soulstoke Phoenix choose a permanent of each type among nonland permanents you control, then create a Life Storage Aura token attached to each of those permanents.
Flying, haste.
3RR, Sacrifice a permanent you control enchanted with a Life Storage: Return Soulstoke Phoenix from your graveyard to the battlefield.
4/4
Legendary Creature - Bird Monk
Flying
When Ishai, of the Frozen Winds enters the battlefield, tap target creature an opponent controls and put a stun counter on it. (If a permanent with a stun counter would become untapped, remove one from it instead.)
Spells you cast that share a color with one or more creatures with stun counters on them, cost 1 less to cast.
2/2
The flavor in general also suggests that the rats killed her? So when she dies only the rat remained?
Don't forget the Goose and the Cooking Book of Hell
Whenever Voldaren Bloodcaster OR another nontoken creature you control dies, create a Blood token.
Means it triggers if any of the following happens:
1) Voldaren Bloodcaster itself dies (regarless if it is a token or not)
2) Voldaren Bloodcaster sees another nontoken creature dying
The card works as intended and need not to be errated
Return Thriumphant seems really good for a common
I like this new Black Enchantress archetype they started supporting lately.
Can you even activate loyalty abilities if you are not a Planeswalker?
It does triggers of itself dying, but yeah the change works.