Fog (and Friends) The classic option to prevent all combat damage is Fog, which has interestingly seen several functional reprints that were color-shifted in Ethereal Haze and Darkness
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Dan Lewis Dan Lewis isnt an especially powerful card, but a two-mana 2/2 with a relevant creature type and supertype opens up a lot of potential synergies
5 Emberheart Challenger A Prowess Player's Dream I've seen aggressive cards get slept-on plenty in early Standard seasons before a Red deck inevitable sweeps a tournament without breaking a sweat
The totally subjective, 100% true, definitely-not-biased list of the best vampires in all of Magic ranked
This means the above Pikachu card can only take a maximum of fifty damage, or have five damage counters on it, because anymore means it would be knocked out