Five mana is a lot in a fast format like Modern, and doubly so when you consider that some of our other combo pieces cost up to seven mana
Taking a random one-drop wont stop them from casting two more, and they have enough game-winners that discarding those is rough even when the spent mana doesnt just mean you lose to 1/1 beatdown
The other is Beckon, which states that during your turn, whenever another character of yours enters play exerted, you may draw a card
For example, a Pokmon reverse holographic card can be seen in a scan, but the only way to identify the particular card would be to read the moveset, or by other special markings
8: You get an emblem with "Lands you control have indestructible." Search your library for any number of Forest cards, put them onto the battlefield tapped, then shuffle