Nim Deathmantle trigger, causing you to pay ({4} magic symbol) to return
Unlucky Cabbage Merchant from your graveyard to the battlefield and attach
Nim Deathmantle to it.
When
Unlucky Cabbage Merchant enters, its first ability triggers, creating a Food token.
Activate
Krark-Clan Ironworks by sacrificing the Food, adding ({C} magic symbol) ({C} magic symbol) .
Unlucky Cabbage Merchant's second ability and
Ygra trigger.
Resolve the
Ygra trigger, putting two +1/+1 counters on it.
Holding priority, repeat steps 1 through 5 one additional time.
Resolve the
Unlucky Cabbage Merchant trigger from step 7, searching your library for a basic land card and putting it onto the battlefield tapped. You will not shuffle
Unlucky Cabbage Merchant as it's a new object.
Repeat from step 6.
Results
Infinite +1/+1 counters on a creature.
Infinite ETB.
Infinite LTB.
Infinite death triggers.
Infinite sacrifice triggers.
Near-infinite landfall triggers.
Put all basic lands from your library onto the battlefield tapped.