If we look at the odds of drawing into one or more Humans when Sigarda triggers, youd need around 22 Humans in the deck
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
Its definitely one of the less impressive adventure lands, but Ishgard, the Holy See still belongs in many decks
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A colorless Land that entered tapped, it wasn't a very good mana source, but its triggered ability proved very powerful
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