The core idea is this: the river water overflows and nourishes the farmlands, the water recedes and the crops grow, the crops are harvested and nourish the citizens
The abilities have good synergy since you can Zombify something that was just milled
You'll only need to spend $1 to activate the automatic discount, so if you end up combining the 50% discount with the $60 gift card, you could get things like Booster Boxes and Blister Packs for free, with Elite Trainer Boxes costing around $20-$30
But while you'll be disappointed with a 20 HP heal knowing you could've had so much more, this is an effect we used to put in every deck without the promise of any upside
When used alongside a card that lets you reshuffle your graveyard back into your deck, Time Walk can still be quite the strong card, and that means its a highly sought-after one, too