edhseer Commander synergy, explained
Instant
Mana cost: {1}{G}{G}
Reveal cards from the top of your library until you reveal a creature card. Put that card into your hand and the rest on the bottom of your library in a random order.
on-cast — searches a library
When you reveal a creature card this way, put X +1/+1 counters on target creature you control, where X is the mana value of that card.
triggered — puts the mana value of that card counters on it
Causes: put a counter on a creature.
Cares about: nothing.
a creature gets a counter — 2,691 cards in the game can cause this (Yuna's Whistle is one).
When a creature gets a counter thanks to Yuna's Whistle:
31 other cards care about it too. These are the ones with the most connections.
an instant is cast — 3,931 cards in the game can cause this (Yuna's Whistle is one).
When Yuna's Whistle is cast:
427 other cards care about it too. These are the ones with the most connections.
anything gets a counter — 4,415 cards in the game can cause this (Yuna's Whistle is one).
7 other cards care about it too. These are the ones with the most connections.
anything is cast — 31,128 cards in the game can cause this (Yuna's Whistle is one).
When Yuna's Whistle is cast:
5 other cards care about it too. These are the ones with the most connections.