Mana Echoes [Onslaught] Commander's Arsenal This card enters the battlefield

This card enters the battlefield attached to that creature

• Return target permanent to its owner's hand

that land doesn't untap during its controller's next untap step

and Dominaria itself to the point of annihilation

Whenever Kalonian Hydra attacks

Mana Echoes [Onslaught] Commander's Arsenal This card enters the battlefieldSet: Onslaught Type: Enchantment Rarity: Rare Cost: {2}{R}{R} Whenever a creature enters the battlefield, you may add an amount of {C} equal to the number of creatures you control that share a creature type with it. When the ground is saturated with mana, even the lightest footstep can bring it to the surface.