Cordial Vampire
Creature — Vampire
Whenever this creature or another creature dies, put a +1/+1 counter on each Vampire you control.
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Winona Nelson
Modern Horizons (MH1)
• #83Rulings
If a Vampire you control is dealt lethal damage at the same time as another creature, they die at the same time. That Vampire can't receive a counter from Cordial Vampire's ability in time to save it.
(wotc • 2019-06-14)
If Cordial Vampire dies at the same time as one or more other creatures, its ability triggers for each of them.
(wotc • 2019-06-14)
Rulings
If a Vampire you control is dealt lethal damage at the same time as another creature, they die at the same time. That Vampire can't receive a counter from Cordial Vampire's ability in time to save it.
(wotc • 2019-06-14)
If Cordial Vampire dies at the same time as one or more other creatures, its ability triggers for each of them.
(wotc • 2019-06-14)