Mana Echoes [Onslaught] Exodus Auntie's Hovel enters the battlefield

Auntie's Hovel enters the battlefield tapped

Set: Commander 2016 Type: Legendary Creature — Human Ally Rarity: Mythic Cost: {2}{R}{W} Whenever Bruse Tarl

the Fantastic Four and the Avengers to do it

Set: Betrayers of Kamigawa Type: Instant — Arcane Rarity: Rare Cost: {X}{U}{U} You may exile a blue card with mana value X from your hand rather than pay this spell's mana cost

quoting Confucius

Mana Echoes [Onslaught] Exodus Auntie's Hovel 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.