A couple of Marnie SSH 169s, that cause a redraw between you and your opponent, will cost you about $1.44 each, sometimes fluctuating up to over $2
Firstly, its not an enchantment, so its not going to die to Mortify or Knight of Autumn or the multitude of other disenchant effects in Standard right now, all of which are going to see plenty of play with so many juicy targets for them, like Wilderness Reclamation and Experimental Frenzy
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The second activation sees the Amplimancers P/T as 4/4 when it resolves, doubling it to 8/8
Ive limited the list to 30 entries, so there are many more cheap cards to consider, though Ive tried to cover as much ground as possible
4 Grim Monolith Dont Look So Grim Spending two mana to get three mana seems like a fine deal, and with Grim Monolith you can get it