Cheapest priced copy (Kaldheim): $0.69 at Card Kingdom, near mint, their price list as of .
Sarulf, Realm Eater 
Legendary Creature — Wolf · 3/3 · Rare · Kaldheim · #228
Whenever a permanent an opponent controls is put into a graveyard from the battlefield, put a +1/+1 counter on Sarulf.
At the beginning of your upkeep, if Sarulf 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.
Legal inCommanderPioneerModernLegacyVintage
Not legal inBrawlStandardPauper
6 printings · $0.69 to $2.99 at Card Kingdom
| Set | Number | Rarity | Card Kingdom | Foil |
|---|---|---|---|---|
| Kaldheim | 228 | Rare | $0.69 | $1.49 |
| Kaldheim | 330 | Rare | $0.69 | $2.49Out of stock |
| Kaldheim Promos | 228p | Rare | $2.49 | $2.99Out of stock |
| Kaldheim Promos | 228s | Rare | — | $2.79 |
| The List | KHM-228 | Rare | $0.69 | — |
| Secret Lair Drop (Zinogre, Lord of Lightning) | 2240 | Rare | — | — |
7 rulings from Wizards of the Coast
- 5 February 2021You may choose to remove Sarulf's +1/+1 counters even if that would cause lethal damage to be marked on Sarulf. If you do this, Sarulf will die after its last ability is finished resolving. But it won't have gone alone! Legendary.
- 5 February 2021You choose whether to remove +1/+1 counters as the last ability is resolving. If you do, the appropriate permanents are then exiled. No one can respond to your choice or take actions during this process.
- 5 February 2021Choosing to remove all the +1/+1 counters on Sarulf won't affect any other counters it may have.
- 5 February 2021If you do remove +1/+1 counters, you must remove all of them. You can't fine-tune the carnage by only removing some of them.
- 5 February 2021It doesn't matter which graveyard the permanent is put into as long as an opponent controlled it when it last existed on the battlefield.
- 5 February 2021If Sarulf isn't on the battlefield as its last ability starts to resolve, you can't remove any +1/+1 counters from it, even if it had +1/+1 counters when it was last on the battlefield. No other permanents will be exiled.
- 5 February 2021If Sarulf doesn't have any +1/+1 counters on it as your upkeep begins, its last ability won't trigger at all. If the ability does trigger, it will check again as it tries to resolve. If Sarulf doesn't have any +1/+1 counters on it at that time, the ability won't do anything. No other permanents will be exiled.