mtg enchant land cards New Horizons [Ixalan] put a +1/+1 counter on target creature you control. Guardian Zendikon - Enchantment -

What is wild here is that I only scratched the surface of valuable cards in the set

I would love more card draw effects but red isn't overdone with them and so I feel a touch light on win mechanisms and a little overdone with mana generation as it stands

It also has the added bonus of allowing you to untap all your creatures outside of your turn, serving as an excellent defensive tool if you have the mana to spare

Considering that both cards are in print and, discounting the Aftermath debacle, is from Magic's newest set, I'd lean towards selling while prices are high unless you plan on building the deck yourself