A fetch land can give you multiple landfall triggers in one turn because you get: the land drop (the fetch land entering), and then another land entering when you crack it
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At any time during your opponent's turn, you can spend a mana to untap Morphling for blocking, give it flying for attacking, increase or decrease its power, or make it immune to spells and abilities
My top five powerful cards list, in no real order, is probably Sol Ring, Black Lotus, Recall, Time Walk and Academy
Now, as I mentioned above, I personally didnt have to pick up the tab for these, but I note it because part of the point of this whole experiment is to see if these Magic products can be played standalone without costing an arm and a leg