They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and will have colons in their reminder text
A "Gem Mint" 10 graded by trusted experts like PSA, BGS, or CGC can be worth 100x more than a "Near Mint" 7
Laezel, Vlaakiths Champion Lae'zel, Vlaakith's Champion lets all your walkers start off with an additional loyalty, and they get an extra counter on any plus ability
On top of that, Hammer of Nazahn gives the creature it's attached to indestructible and can also be equipped as it enters the battlefield, immediately protecting any creature you want from being destroyed
If you are also playing a deck that plays out of the graveyard, Party Thrasher can discard cards while digging you deeper into your deck
There's way more involved than just paying two mana