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If an ability would produce one or more mana of an undefined type, it produces no mana instead.

Some abilities produce mana based on the type of mana another permanent or permanents “could produce.” The type of mana a permanent could produce at any time includes any type of mana that an ability of that permanent would produce if the ability were to resolve at that time, taking into account any applicable replacement effects in any possible order. Ignore whether any costs of the ability could or could not be paid. If that permanent wouldn’t produce any mana under these conditions, or no type of mana can be defined this way, there’s no type of mana it could produce.

To “tap [a permanent] for mana” is to activate a mana ability of that permanent that includes the {T} symbol in its activation cost. See rule 605, “Mana Abilities.”

An ability that triggers whenever a permanent “is tapped for mana” or is tapped for mana of a specified type triggers whenever such a mana ability resolves and produces mana or the specified type of mana.

A replacement effect that applies if a permanent “is tapped for mana” or tapped for mana of a specific type and/or amount modifies the mana production event while such an ability is resolving and producing mana or the specified type and/or amount of mana.

If an object’s enters-the-battlefield triggered ability or replacement effect refers to X, and the spell that became that object as it resolved had a value of X chosen for any of its costs, the value of X for that ability is the same as the value of X for that spell, although the value of X for that permanent is 0. This is an exception to rule 107.3i.

The tap symbol is {T}. The tap symbol in an activation cost means “Tap this permanent.” A permanent that’s already tapped can’t be tapped again to pay the cost. A creature’s activated ability with the tap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

The untap symbol is {Q}. The untap symbol in an activation cost means “Untap this permanent.” A permanent that’s already untapped can’t be untapped again to pay the cost. A creature’s activated ability with the untap symbol in its activation cost can’t be activated unless the creature has been under its controller’s control continuously since their most recent turn began. See rule 302.6.

You 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.

You 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.

Choosing to remove all the +1/+1 counters on Sarulf won't affect any other counters it may have.

If 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.

It doesn't matter which graveyard the permanent is put into as long as an opponent controlled it when it last existed on the battlefield.

If 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.

If 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.