Goliath Hatchery

You may choose any creature you control, including one that doesn't have toxic, if you don't want to draw cards. If you don't control any creatures, you won't draw any cards.

The "total toxic value" of a creature is usually just the number after the word toxic on that creature. However, if a creature has gained multiple instances of toxic, the total toxic value of that creature is the sum of those numbers. For example, if a creature that has toxic 2 later gains toxic 1 due to an effect, it has both toxic 1 and toxic 2, and its total toxic value is 3.

Any other effects of that damage, such as life gain from lifelink, still apply.

Toxic doesn't change the amount of combat damage a creature deals. For example, if a 2/2 creature with toxic 1 deals combat damage to a player, that creature will deal 2 damage. The results of that damage are the player loses 2 life and gets a poison counter.

Damage dealt by a creature with toxic grants the same number of counters regardless of how much damage is dealt. Notably, if a replacement effect modifies the damage in some way (such as that of Gratuitous Violence), the number of counters given remains unchanged.

A player with ten or more poison counters loses the game. This is a state-based action and doesn't use the stack. In other words, it happens immediately and players can't respond to it, just like a player losing the game due to having 0 or less life.