Avoid Dead Cards: Ben Rubin notes that one of the key ways a control deck devalues the other deck's cards is by making certain cards in that deck useless
Out of all the cards on this list, Tishana, Voice of Thunder is the one Im least sure about, but as with Rowdy Crew, its too powerful not to mention
Hes a bit of a nonbo with Tarmogoyf, but that can be mitigated to an extent, and hell be able to fit in decks that may not be able to cast/support Tarmogoyf
In the rare case where the original creature is copying something else when the offspring ability resolves, the token enters as whatever that creature copied, except it's a 1/1
Its especially surprising that its cEDH thats doing it, given that Ophidian Eye costs 3 mana, but apparently this is good enough in some Malcolm, Keen-Eyed Navigator or Niv-Mizzet, Parun decks