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The first affinity cards had affinity for artifacts, so its easy to forget that other affinities exist (for lands, creatures, and more)

If you copy a Thundertrap Trainer with offspring, when the kid enters it also lets you look at the top four cards of your library and put one in your hand

It can provide a 1/1 Goblin early on and a Trample giving Equipment later in the game

You may reveal a Dinosaur or land card from among them and put it into your hand

Personally, I really like Marina Vendrell because there are no restrictions when building around them, giving you access to every enchantment ever printed in Magic: The Gathering