Elenda, the Dusk Rose
Legendary Creature — Vampire Knight
Lifelink
Whenever another creature dies, put a +1/+1 counter on Elenda, the Dusk Rose.
When Elenda dies, create X 1/1 white Vampire creature tokens with lifelink, where X is Elenda's power.
Her centuries-long search is ended.
Illustrated by
Rivals of Ixalan#157MythicEnglishLegality
Rulings
If Elenda dies at the same time as another creature, both of its triggered abilities trigger. However, the first one won’t do anything since you can’t put a +1/+1 counter on Elenda.
To determine how many Vampire tokens are created, use Elenda’s power as it last existed on the battlefield.
If Elenda would die and it’s your commander in the Commander variant, you may put it into the command zone instead. However, if you save Elenda this way, it doesn’t die and you won’t create any Vampire tokens.