Schirmhydra

Die Schirmhydra kommt mit X +1/+1-Marken ins Spiel.
Wenn die Schirmhydra stirbt, erzeuge für jede +1/+1-Marke auf ihr einen 1/1 grünen Ophis-Kreaturenspielstein.
Morph {3}{G}{G}
Sowie die Schirmhydra aufgedeckt wird, lege fünf +1/+1-Marken auf sie.

Hydre cagoularde

L'Hydre cagoularde arrive sur le champ de bataille avec X marqueurs +1/+1 sur elle.
Quand l'Hydre cagoularde meurt, créez un jeton de créature 1/1 verte Serpent pour chaque marqueur +1/+1 sur elle.
Mue {3}{G}{G}
Au moment où l'Hydre cagoularde est retournée face visible, mettez cinq marqueurs +1/+1 sur elle.

Idra dal Cappuccio

L'Idra dal Cappuccio entra nel campo di battaglia con X segnalini +1/+1.
Quando l'Idra dal Cappuccio muore, crea una pedina creatura Serpente 1/1 verde per ogni segnalino +1/+1 su di essa.
Metamorfosi {3}{G}{G}
Mentre l'Idra dal Cappuccio viene girata a faccia in su, metti su di essa cinque segnalini +1/+1.

頭巾被りのハイドラ

頭巾被りのハイドラは、＋１/＋１カウンターＸ個が置かれた状態で戦場に出る。
頭巾被りのハイドラが死亡したとき、これの上にある＋１/＋１カウンター１個につき１体の、緑の１/１の蛇・クリーチャー・トークンを生成する。
変異{3}{G}{G}
頭巾被りのハイドラが表向きになるに際し、これの上に＋１/＋１カウンター５個を置く。

Hooded Hydra

Hooded Hydra enters with X +1/+1 counters on it.
When Hooded Hydra dies, create a 1/1 green Snake creature token for each +1/+1 counter on it.
Morph {3}{G}{G}
As Hooded Hydra is turned face up, put five +1/+1 counters on it.

Murders at Karlov Manor Commander

Hooded Hydra enters the battlefield with X +1/+1 counters on it.
When Hooded Hydra dies, create a 1/1 green Snake creature token for each +1/+1 counter on it.
Morph {3}{G}{G}
As Hooded Hydra is turned face up, put five +1/+1 counters on it.

Commander 2019

Khans of Tarkir

Hooded Hydra enters the battlefield with X +1/+1 counters on it.
When Hooded Hydra dies, put a 1/1 green Snake creature token onto the battlefield for each +1/+1 counter on it.
Morph {3}{G}{G}
As Hooded Hydra is turned face up, put five +1/+1 counters on it.

A permanent that turns face up or face down changes characteristics but is otherwise the same permanent. Spells and abilities that were targeting that permanent, as well as Auras and Equipment that were attached to the permanent, aren't affected.

Any time you have priority, you may turn the face-down creature face up by revealing what its morph cost is and paying that cost. This is a special action. It doesn't use the stack and can't be responded to. Only a face-down permanent can be turned face up this way; a face-down spell cannot.

At any time, you can look at a face-down spell or permanent you control. You can't look at face-down spells or permanents you don't control unless an effect instructs you to do so.

Because the permanent is on the battlefield both before and after it's turned face up, turning a permanent face up doesn't cause any enters-the-battlefield abilities to trigger.

Hooded Hydra's last ability isn't a triggered ability. It's a replacement ability that modifies how Hooded Hydra is turned face up. Players can't respond to Hooded Hydra being turned face up and having five +1/+1 counters put on it.

If Hooded Hydra is face down and it's turned face up some other way than by having its morph cost paid, the last ability will still apply.

If a face-down permanent leaves the battlefield, you must reveal it. You must also reveal all face-down spells and permanents you control if you leave the game or if the game ends.

Morph lets you cast a card face down by paying {3}, and lets you turn the face-down permanent face up any time you have priority by paying its morph cost.

The face-down spell has no mana cost and has a mana value of 0. When you cast a face-down spell, put it on the stack face down so no other player knows what it is, and pay {3}. This is an alternative cost.

Use the number of +1/+1 counters that were on Hooded Hydra the last time it was on the battlefield to determine how many Snake tokens to create.

When the spell resolves, it enters the battlefield as a 2/2 creature with no name, mana cost, creature types, or abilities. It's colorless and has a mana value of 0. Other effects that apply to the creature can still grant it any of these characteristics.

You must ensure that your face-down spells and permanents can easily be differentiated from each other. You're not allowed to mix up the cards that represent them on the battlefield in order to confuse other players. The order they entered the battlefield should remain clear. Common methods for doing this include using markers or dice, or simply placing them in order on the battlefield.