Moosgeborene Hydra

Verursacht Trampelschaden (Diese Kreatur kann überschüssigen Kampfschaden dem verteidigenden Spieler oder Planeswalker zufügen.)
Diese Kreatur kommt mit einer +1/+1-Marke ins Spiel.
Landung — Immer wenn ein Land unter deiner Kontrolle ins Spiel kommt, verdopple die Anzahl an +1/+1-Marken auf dieser Kreatur.

Hidra musgogénita

Arrolla. (Esta criatura puede hacer el daño de combate sobrante al jugador o planeswalker al que ataca.)
Esta criatura entra con un contador +1/+1 sobre ella.
Aterrizaje — Siempre que una tierra que controlas entre, duplica la cantidad de contadores +1/+1 sobre esta criatura.

Hydre née de la mousse

Piétinement (Cette créature peut infliger son surplus de blessures de combat au joueur ou au planeswalker qu'elle attaque.)
Cette créature arrive avec un marqueur +1/+1 sur elle.
Toucheterre — À chaque fois qu'un terrain que vous contrôlez arrive, doublez le nombre de marqueurs +1/+1 sur cette créature.

Idra Muschiogena

Travolgere (Questa creatura può infliggere il danno da combattimento in eccesso al giocatore o al planeswalker che sta attaccando.)
Questa creatura entra con un segnalino +1/+1.
Terraferma — Ogniqualvolta una terra che controlli entra, raddoppia il numero di segnalini +1/+1 su questa creatura.

苔生まれのハイドラ

トランプル（このクリーチャーは余剰の戦闘ダメージを、これが攻撃しているプレイヤーかプレインズウォーカーに与えることができる。）
このクリーチャーは＋１/＋１カウンター１個が置かれた状態で戦場に出る。
上陸 ― あなたがコントロールしている土地１つが戦場に出るたび、このクリーチャーの上にある＋１/＋１カウンターの個数を２倍にする。

Mossborn Hydra

Trample (This creature can deal excess combat damage to the player or planeswalker it's attacking.)
This creature enters with a +1/+1 counter on it.
Landfall — Whenever a land you control enters, double the number of +1/+1 counters on this creature.

Foundations Promos

Foundations

Trample
This creature enters with a +1/+1 counter on it.
Landfall — Whenever a land you control enters, double the number of +1/+1 counters on this creature.

A landfall ability doesn't trigger if a permanent already on the battlefield becomes a land.

A landfall ability triggers whenever a land you control enters for any reason. It triggers whenever you play a land, as well as whenever a spell or ability puts a land onto the battlefield under your control.

If Mossborn Hydra somehow enters at the same time as one or more other lands you control, its last ability triggers for each of those lands.

To double the number of +1/+1 counters on Mossborn Hydra, put a number of +1/+1 counters on it equal to the number it already has. Other cards that interact with putting counters on it will interact with this effect accordingly.

Whenever a land you control enters, each landfall ability of the permanents you control will trigger. You can put them   on the stack in any order. The last ability you put on the stack will be the first one to resolve (As a result, you can have those abilities resolve in the order of your choosing.).