Thalia and The Gitrog Monster

First strike, deathtouch
You may play an additional land on each of your turns.
Creatures and nonbasic lands your opponents control enter tapped.
Whenever Thalia and The Gitrog Monster attacks, sacrifice a creature or land, then draw a card.

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March of the Machine Promos

March of the Machine

First strike, deathtouch
You may play an additional land on each of your turns.
Creatures and nonbasic lands your opponents control enter the battlefield tapped.
Whenever Thalia and The Gitrog Monster attacks, sacrifice a creature or land, then draw a card.

As the last ability resolves, sacrificing a creature or land isn’t optional. If you control a creature or land (and if you control Thalia and The Gitrog Monster, you probably do), you must sacrifice one.

The effect of Thalia and The Gitrog Monster’s ability that allows you to play an additional land is cumulative with similar effects. For example, if you control Thalia and The Gitrog Monster and another permanent with that ability, you’ll be able to play three lands during each of your turns.