edhseer Commander synergy, explained
Instant
Mana cost: {3}{W}
Search your library and/or outside the game for exactly four legendary creature cards you own with different names, then reveal those cards. An opponent chooses two of them. Put the chosen cards into your hand and shuffle the rest into your library.
on-cast — searches a library
on-cast —
Causes: search creature , shuffle a library.
Cares about: nothing.
an instant is cast — 3,931 cards in the game can cause this (Turtles Forever is one).
When Turtles Forever is cast:
427 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 (Turtles Forever is one).
When Turtles Forever is cast:
5 other cards care about it too. These are the ones with the most connections.