edhseer Commander synergy, explained
Creature — Mouse
Mana cost: {1}{R}
The second spell you cast each turn costs {1} less to cast.
static — costs 1 less
At the beginning of combat on your turn, if two or more nonland permanents entered the battlefield under your control this turn, target creature you control gets +1/+1 until end of turn.
triggered — gives +1/+1
Causes: nothing.
Cares about: the beginning of combat, a creature it makes cheaper to cast, an artifact it makes cheaper to cast, an enchantment it makes cheaper to cast, a planeswalker it makes cheaper to cast, an instant it makes cheaper to cast, a sorcery it makes cheaper to cast, a battle it makes cheaper to cast.
an enchantment it makes cheaper to cast — 3,713 cards in the game can cause this (Raging Battle Mouse is one).
Raging Battle Mouse reduces what:
3,711 other cards care about it too. These are the ones with the most connections.
an artifact it makes cheaper to cast — 4,531 cards in the game can cause this (Raging Battle Mouse is one).
Raging Battle Mouse reduces what:
4,523 other cards care about it too. These are the ones with the most connections.
anything attacks — 17,934 cards in the game can cause this (Raging Battle Mouse is one).
When Raging Battle Mouse attacks:
496 other cards care about it too. These are the ones with the most connections.
a creature attacks — 17,934 cards in the game can cause this (Raging Battle Mouse is one).
When Raging Battle Mouse attacks:
873 other cards care about it too. These are the ones with the most connections.
a creature blocks — 17,934 cards in the game can cause this (Raging Battle Mouse is one).
When Raging Battle Mouse blocks:
132 other cards care about it too. These are the ones with the most connections.
a nontoken creature attacks — 17,934 cards in the game can cause this (Raging Battle Mouse is one).
When Raging Battle Mouse attacks:
a creature it makes cheaper to cast — 19,392 cards in the game can cause this (Raging Battle Mouse is one).
Raging Battle Mouse reduces what:
19,381 other cards care about it too. These are the ones with the most connections.
a creature enters the battlefield — 19,800 cards in the game can cause this (Raging Battle Mouse is one).
When Raging Battle Mouse enters:
3,031 other cards care about it too. These are the ones with the most connections.
anything enters the battlefield — 26,499 cards in the game can cause this (Raging Battle Mouse is one).
688 other cards care about it too. These are the ones with the most connections.