Icetill Explorer is the complete package, allowing you to play two lands a turn, play lands from your graveyard, and mill them from your library
A lot of link monsters have effects that care about cards in the zones theyre pointing to
Also, its on the Reserved List
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And they can be different creatures (remember that you can overpay the saddle cost, and tap two other creatures if you want)
It's easy to use as Xyz material, and you can call Xyz with LIGHT binding, so it's a card with unexpected possibilities