Most archetypes dont support them well, and they often just end up as underwhelming filler
Calgar being able to take tokens of all sorts and turn them into cards, or turn surplus mana back into more Space Marines is pretty decent at translating his acumen for eking all available advantage into victory
attached to your leader, all of your characters will receive a point to their cost, making it a bit harder for decks like Rob Lucci to remove from the board
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Skirmish Rhino Sometimes simple is best, and Skirmish Rhino delivers exactly that
And Sentry Bot does the same, while potentially rescuing you from an alpha strike
