While just enchanting things for value is a fine, fun way to play Estrid, the Masked, things can get out of control quickly if you start playing cards like Overgrowth and Fertile Ground so that Estrid's +2 acts like a massive ramp spell, and then The Chain Veil (perhaps enchanted with a Mask aura thanks to Estrid's 1) give you an easy way to activate your Estrid, the Masked an infinite number of times, potentially making infinite mana by untapping your lands and eventually winning with her Replenish ultimate
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You lose two life, put it on top, and draw exactly what you need on your turn
Here is the process that works
Instant Color tag templates(None) Reality Shift Exile target creature
Other cheap cards Im excited to play with: Dragonborn Champion, Hurl Through Hell, Maddening Hex, Netherese Puzzle-Ward, Vengeful Ancestor, Sudden Insight, Deadly Dispute, Flumph, Ingenious Smith, and Meteor Swarm