Battering Krasis is one of those cards players keep asking about. Here is, in plain words, what its official text says, the rulings published by Wizards of the Coast, and the combos players actually run.
Official card text
Trample Evolve (Whenever a creature you control enters, if that creature has greater power or toughness than this creature, put a +1/+1 counter on this creature.)
Complete guide
Battering Krasis is a versatile Shark Beast that embodies the Simic philosophy of constant growth. With the Evolve keyword and Trample, it starts as a modest threat but quickly scales into a massive attacker that opponents cannot easily ignore.
How Evolve Works
Evolve is a triggered ability that checks the power and toughness of a new creature entering the battlefield against Battering Krasis. For the ability to trigger, the entering creature must have a higher power OR a higher toughness than Battering Krasis. If both stats are equal to or lesser than the Krasis, nothing happens. Once triggered, the ability checks these stats again upon resolution to ensure the new creature is still larger.
The Resolution Process
When a creature enters, the game performs an initial check. If it passes, the Evolve trigger goes on the stack. As the trigger resolves, the game checks the stats a second time. If Battering Krasis has grown in response (perhaps from another Evolve trigger) and is now equal to or larger than the new creature in both stats, no counter is placed. If the new creature leaves the battlefield before resolution, the game uses its last known information for this comparison.
Common Mistakes
A common error is assuming you compare power to toughness; you must always compare power to power and toughness to toughness. Additionally, if multiple creatures enter simultaneously, Evolve triggers for each. However, because these triggers resolve one by one, Battering Krasis might grow large enough from the first resolution to prevent the subsequent triggers from granting additional counters.
When to Play It
Battering Krasis is best played early in the game when your subsequent creature spells are likely to be larger than a 2/1. Because it has Trample, every +1/+1 counter it gains becomes significantly more valuable, allowing it to push damage through small blockers even as it continues to evolve.
Interaction examples
Solemn SimulacrumYou control a 2/1 Battering Krasis and cast Solemn Simulacrum. When the 2/2 Golem enters, the game compares stats: 2 power is not greater than 2 power, but 2 toughness is greater than 1 toughness. Evolve triggers. Upon resolution, Battering Krasis becomes a 3/2 creature.
Sakura-Tribe ElderYou control a 2/1 Battering Krasis and cast Sakura-Tribe Elder. When the 1/1 Snake enters, the game checks its stats. Since 1 power is not greater than 2, and 1 toughness is not greater than 1, Evolve does not trigger at all. Battering Krasis remains a 2/1.
Guide written with AI from the official text and rulings. Official English text prevails.
How it works : Battering Krasis
Original English text — Wizards of the Coast / Scryfall
- #1· Wizards of the Coast
When comparing the stats of the two creatures for evolve, you always compare power to power and toughness to toughness.
No other card is named in this ruling.
- #2· Wizards of the Coast
Whenever a creature enters the battlefield under your control, check its power and toughness against the power and toughness of the creature with evolve. If neither stat of the new creature is greater, evolve won’t trigger at all.
No other card is named in this ruling.
- #3· Wizards of the Coast
If evolve triggers, the stat comparison will happen again when the ability tries to resolve. If neither stat of the new creature is greater, the ability will do nothing. If the creature that entered the battlefield leaves the battlefield before evolve tries to resolve, use its last known power and toughness to compare the stats.
No other card is named in this ruling.
- #4· Wizards of the Coast
If a creature enters the battlefield with +1/+1 counters on it, consider those counters when determining if evolve will trigger. For example, a 1/1 creature that enters the battlefield with two +1/+1 counters on it will cause the evolve ability of a 2/2 creature to trigger.
No other card is named in this ruling.
- #5· Wizards of the Coast
If multiple creatures enter the battlefield at the same time, evolve may trigger multiple times, although the stat comparison will take place each time one of those abilities tries to resolve. For example, if you control a 2/2 creature with evolve and two 3/3 creatures enter the battlefield, evolve will trigger twice. The first ability will resolve and put a +1/+1 counter on the creature with evolve. When the second ability tries to resolve, neither the power nor the toughness of the new creature is greater than that of the creature with evolve, so that ability does nothing.
No other card is named in this ruling.
- #6· Wizards of the Coast
When comparing the stats as the evolve ability resolves, it’s possible that the stat that’s greater changes from power to toughness or vice versa. If this happens, the ability will still resolve and you’ll put a +1/+1 counter on the creature with evolve. For example, if you control a 2/2 creature with evolve and a 1/3 creature enters the battlefield under your control, it toughness is greater so evolve will trigger. In response, the 1/3 creature gets +2/-2. When the evolve trigger tries to resolve, its power is greater. You’ll put a +1/+1 counter on the creature with evolve.
No other card is named in this ruling.
Legal formats
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Meta decks with Battering Krasis
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