They're generally written "[Cost]: [Effect]." Some keyword abilities (such as equip) are activated abilities and will have colons in their reminder text
Esper Sentinel Sure, another did you pay the X? card is mildly annoying, but theres a great deal of value in this little one-drop
Agent of the Shadow Thieves is a 2-drop background that will let my attacking Durnan get a +1/+1 counter and deathtouch and indestructible until the end of the turn
Simba appears on three cards from the Steel deck, each with its own set of benefits one even has the rare "Evasive" trait which will surely be useful during gameplay
You can help remedy this by practicing with the deck, goldfishing, and generally getting more familiar with how the deck plays and what it wants to accomplish
A couple of days ago, Wizards of the Coast revealed four Final Fantasy Commander decks all at once