When looking for a deck to combine with in the Beginner Box, look for complimentary decks that also have ways of dispersing +1/+1 counters
Because decks with Gaeas Cradle tend to search for Gaeas Cradle pretty reliably and you can assemble this combo whenever you get a witness with Cradle and enough creatures if youve already cast Snap, I try to play Snap as one of my interactive spells in any deck with Gaeas Cradle
Kindred Discovery won't fit every deck, but it can be a good fit in merfolk decks, or in blink decks that care about good ETB creatures, like wizard decks
Whenever you cast a Pegasus, Unicorn, or Horse creature spell, copy it
Then the artifact at the end four-cost can tap to do the same, but just the first one and for three less