Not only do these cards often fail to immediately impact the board, but equipment is often reined in by expensive Equip costs
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This fiexes your mana well and can threaten to be a 3/3 when it attacks, allowing it to get through and/or trade reasonably well
I see it being much more widely used as a card in the main deck, however
The +1 turns fetch lands into a recurring resource loop, the 1 keeps mana dorks and utility creatures honest, and the emblem is pure nonsense once your graveyard fills up
Sea creature decks love it, but so do toughness-matters decks like Arcades, the Strategist, The Pride of Hull Clade, Phenax, God of Deception, and Plagon, Lord of the Beach, to name a few