TetravusHow it works & interactions with other cards

What It Does

Tetravus enters the battlefield with three +1/+1 counters, making it a 4/4 flyer for six mana. Its unique utility lies in its two upkeep abilities: one allows you to convert any number of its +1/+1 counters into 1/1 flying Tetravite tokens, and the other allows you to exile those specific tokens to return the counters to Tetravus. Notably, these tokens possess a rare protection: they cannot be enchanted.

How It Resolves Step by Step

At the start of your upkeep, both of Tetravus's abilities trigger simultaneously. Since you control both, you choose the order they are placed on the stack. If you choose to return tokens first, that ability resolves, increasing Tetravus's size. Then, the second ability resolves, allowing you to create new tokens if desired. You can convert any +1/+1 counters on Tetravus, regardless of how they were placed there, but you can only reclaim tokens created by that specific Tetravus instance.

Common Mistakes

A frequent error is assuming you can reclaim any Tetravite tokens. If you control two different Tetravus cards, each can only 'reclaim' the tokens it specifically created. Additionally, players often forget that the tokens cannot be enchanted; if you attempt to cast an Aura on a Tetravite, the spell will be illegal or the Aura will fall off. Finally, remember that if Tetravus leaves the battlefield, any existing Tetravite tokens remain on the board but can no longer be converted back into counters.

When to Play It

Tetravus is ideal for strategies that benefit from having multiple creatures or artifact triggers. By splitting into four bodies (Tetravus and three tokens), you can bypass single-target removal or provide multiple blockers. Alternatively, keeping it as a single 4/4 flyer is better for aggressive pressure against opponents with limited air defense.

Interaction examples

Generating a Flying Army

During your upkeep, you choose to remove all three +1/+1 counters from Tetravus. This creates three 1/1 colorless Tetravite artifact creature tokens with flying. You now have four flying creatures (a 1/1 Tetravus and three 1/1 tokens) to attack or block with.

Dealing with Targeted Removal

Meteor Golem

If an opponent plays Meteor Golem to destroy your Tetravus while it has no counters (because you turned them into tokens), only the 1/1 Tetravus body is destroyed. The three Tetravite tokens remain on the battlefield as independent 1/1 flyers, preserving your board presence.

Synergy and Stat Tracking

Psychosis Crawler

While Psychosis Crawler scales with your hand size, Tetravus provides a flexible physical board presence. If you need to defend against multiple small attackers that Psychosis Crawler cannot block alone, you can use Tetravus's upkeep trigger to split into four separate blockers, ensuring you survive to draw more cards and trigger the Crawler's life-loss ability.