Exile-based removal is usually pretty expensive or hard to cast, and this does give some warning to the other players
All the new Doctor Who cards come in four Commander precons, and theres an abundance of legendary creatures that can be commanders as well as the doctors companions, which are a different take on partner
if you sacrifice a persist creature with Celes in play, it enters with a -1/-1 counter and a +1/+1 counter, which cancel each other out
Other ways to force a round of Solar triggers include creatures like Hostage Taker which can cause additional ETBs as they enter and leave the battlefield, or creatures which have an ability to enter the battlefield for zero mana, such as Solitude
They're generally written "[Cost]: [Effect]." Some keywords are activated abilities and may have colons in their reminder text
As soon as I get to 5,000 coins I pretty much pull the trigger on a ranked draft