Tetravus {6}
Artifact Creature — Construct
Flying
This creature enters with three +1/+1 counters on it.
At the beginning of your upkeep, you may remove any number of +1/+1 counters from this creature. If you do, create that many 1/1 colorless Tetravite artifact creature tokens. They each have flying and "This token can't be enchanted."
At the beginning of your upkeep, you may exile any number of tokens created with this creature. If you do, put that many +1/+1 counters on this creature.
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Magmasaur 91%
#26893
"At the beginning of your upkeep, you may remove a +1/+1 counter from this creature. If you don't, sacrifice this creature and it deals damage equal to the number of +1/+1 counters on it to each creature without flying and each player."
+1 more matching line
Vebulid 88%
$0.65#25829
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
+1 more matching line
Rushwood Elemental 88%
$0.89#27656
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
Chlorophant 88%
$0.44#27433
"At the beginning of your upkeep, you may put a +1/+1 counter on this creature."
+1 more matching line
Ingenious Prodigy 87%
$0.25#3206
"At the beginning of your upkeep, if this creature has one or more +1/+1 counters on it, you may remove a +1/+1 counter from it. If you do, draw a card."
+1 more matching line
Myr Prototype 85%
$0.17#22902
"At the beginning of your upkeep, put a +1/+1 counter on this creature."
Wiitigo 83%
#29999
"At the beginning of your upkeep, put a +1/+1 counter on this creature if it has blocked or been blocked since your last upkeep. Otherwise, remove a +1/+1 counter from it."
+1 more matching line
Sarulf, Realm Eater 80%
$0.35#11833
"At the beginning of your upkeep, if this card has one or more +1/+1 counters on it, you may remove all of them. If you do, exile each other nonland permanent with mana value less than or equal to the number of counters removed this way."
Charnel Troll 80%
$0.12#28482
"At the beginning of your upkeep, exile a creature card from your graveyard. If you do, put a +1/+1 counter on this creature. Otherwise, sacrifice it."