For each creature I sacrifice, Mycoloth will get two +1/+1 counters and on my upkeep I'll make a 1/1 Green Saproling for each counter on it
And in Ixalan - nice to get another look before we return in MTG Lost Caverns of Ixalan - Ghalta and Mavren provides both Dinosaur and Vampire tribal effects
Whenever a creature you control dies, each opponent loses 1 life
(2025-10-02) If you return an Aura this way, you choose what the Aura will enchant just before it enters, but you can't choose any permanent cards that will enter at the same time as that Aura
The fact that its Blue fits the theme, but it also means youve got access to plenty of spells that will allow you to utilise this to either control the board state, your opponents hands, their library - or basically whatever else you want
Avalanche Caller can animate your snow lands into 4/4 elementals, while Boreal Outrider makes your creatures enter with a +1/+1 counter if snow mana was used to cast them