Unless the attacking creature leaves combat, it continues to be a blocked creature through the end of combat step, even if the creature or creatures that blocked it are no longer on the battlefield or have otherwise left combat by then
In white, blinking permanents does the trick, while red gets impulse draw and exiles cards this way
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Ajani, Caller of the Pride Archangel of Thune Chandra, Pyromaster Darksteel Forge Devout Invocation Garruk, Caller of Beasts Jace, Memory Adept Kalonian Hydra Liliana of the Dark Realms Primeval Bounty Ring of Three Wishes Rise of the Dark Realms Scourge of Valkas Shadowborn Demon Windreader Sphinx
In-game asset that hasn't yet been used
The card synergizes with blink effects like Ephemerate and Teleportation Circle, letting you rack up counters faster