Black offers some unconditional removal like Assassin's Trophy, which could at least be helpful in the sideboard, while red offers haste in the form of Rhythm of the Wild, which is a great way to maximize Elves' combo potential by allowing us to immediately tap our mana dorks when we are comboing off with Beast Whisperer
Lands that add more value to this deck are Echoing Deeps, Treasure Vault, and Forbidden Orchard
cards list, I had to stretch it to top 11 after seeing Pocahontas and Meeko only just barely made the cut
Flick a Coin may be the best of these, however, since it also plays nicely with your other combo pieces
If it hasnt learned from it, then the crossovers may well be doomed but, with the potential for increasingly aggressive monetisation and more cards which arent limited in reality but are limited because Wizards of the Coast said so, that could well be the least of our worries
The Undertaker allows me to deliver some really strong games while shoring up a glaring weakness in my Commander strategy suite