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Sacrifice this enchantment: Creatures you control get +0/+3 until end of turn.

This might even discourage your opponent from swinging at you with their best creatures, giving you a little more time to find an answer

For instance, the version of the card recently printed in MTG Lord of the Rings has gone from $0.50 to $6, a 1100% increase, and this version from the MTG Secret Lair Psychedelic Show has gone up by $20, from $8.50 to $30

As it so often happens, the earliest examples are in a different part of the color pie than the latter ones

Contents: 15 Magic: The Gathering cards plus 1 Token or advertisement card

That condition can be easily achieved in commander with a creature and something that gives lands every basic land type, like Prismatic Omen