That first line that gives him a discount for each land in your graveyard also affects his commander tax, which means that with a little setup, casting a 6/6 for 3 mana can become somewhat trivial
Control and midrange pilots often consider these to be some of the best dual lands in MTG for their ability to convert mana into threats without diluting spell density
bouncing a creature can result in strong tempo, but the Giant Growth mode is functionally a removal spell if you get into combat
This is mostly a Commander card, because its more than a little bit banned in most other formats, but when it works, it can skyrocket you to greatness, especially if you pair it with a card like Sol Ring
But, if youre in a Commander meta where people are not trusted when they say what their decks cant do, these cards may well make you an unwitting target
Some spells care about one type or the other