Primordial OozeHow it works & interactions with other cards

Feeding the Ooze

Primordial Ooze has a mandatory attack requirement and an upkeep trigger that increases its power every turn. During your upkeep, you first place a +1/+1 counter on it, then decide whether to pay mana equal to the new total of counters. If you cannot or choose not to pay, the Ooze is tapped and deals damage to you equal to its current number of +1/+1 counters.

Step-by-Step Resolution

When your upkeep begins, the trigger goes on the stack. First, you add one +1/+1 counter to Primordial Ooze. Immediately after the counter is placed, the game checks how many +1/+1 counters are on it to determine the value of X. You then choose to either pay {X} mana or suffer the consequences. If you don't pay, the creature is tapped and you take X damage; notably, the creature becomes tapped even if the damage is prevented by another effect.

Strategic Considerations

Because the Ooze must attack each combat if able, the tapping penalty in the upkeep can actually be used defensively to prevent it from running into a larger blocker. However, if you want it to attack, you must ensure you have the mana ready to pay the cost. As the game progresses, the cost X increases, often forcing a choice between casting new spells or maintaining your life total.

Common Pitfalls

A common mistake is forgetting that the counter is added before you pay the mana. If the Ooze has two counters, you will have to pay {3} during your next upkeep because the third counter is added first. Additionally, the tapping happens during the upkeep, meaning if you fail to pay, the creature will not be available to block during your opponent's next turn or attack during your own combat phase.

Interaction examples

Fueling Growth

Ornithopter of Paradise

During your upkeep, Primordial Ooze gains a +1/+1 counter. If it now has two counters, you must pay {2}. You can tap Ornithopter of Paradise to add {R} or any other color to help cover this cost, ensuring Primordial Ooze remains untapped and ready to attack during your combat phase.

Aggressive Openings

Ragavan, Nimble Pilferer

On turn one, you play Primordial Ooze. On turn two, it gains its first counter. If you choose not to pay {1}, it taps and deals 1 damage to you. You can then use your remaining mana to cast Ragavan, Nimble Pilferer. Since the Ooze is already tapped, it won't be able to fulfill its 'attack if able' requirement this turn, allowing you to focus your combat strategy on Ragavan's trigger.