The colon is also only used in activated abilities though you might find it in the name of a few select cards and summons
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Silas Renn, Seeker Adept Deathtouch sometimes says your creature is unblockable, but not always, especially when your opponents know you'll be re-casting an artifact
Since he can't quest for lore, this does seem mostly like a slightly worse Beast, Relentless, but there may be some clever tricks you can pull by giving Hook Resist
If you include it, be intentional about your table expectations and be ready for people to prioritize removing it
Dispel needs to be in ANY deck with champions able to cast cleric spells, in any format, period