When everything else in your deck cycles for one, cycling for three no longer seems like a huge upside and you never want your land to enter play tapped
Discard effects also act as a tempo loss, because youre spending one mana to trade one card for one card and theyre spending no mana
A lot of hydras are very efficient at their mana value and a lot of them have X in their cost which scales with the game or allows you to spend more mana on their activated abilities
Eddytrail Hawk: [Category 2] ETB yield is 2 Energy for 2 mana, then you can spend 1 Energy on an attack trigger to give another creature Flying
If you do, it enters the battlefield as a copy of one of those cards with a number of additional +1/+1 counters on it equal to the power of the other card. Basically, they can become any creature in any graveyard, and then get some +1/+1 counters on them to boot
Fakes can hurt a collection, decrease value, and cause disappointment