Pay the eternalize cost, exile the card from your graveyard, and be richly rewarded with a 4/4 copy of that card, except it's a black Zombie in addition to its other types and it has no mana cost (and thus has mana value 0)
Run the numbers
Although both of these effects are useful, theres no real synergy between them, beyond the fact that they are both vaguely Control focussed effects
Foil $3.46 Price History Your Inventory Sign in to see your inventory Data Reserved List No All Time High $28.99 All Time Low $1.54 Foil Multiplier 1.38x Spread 54.0% Buy List $1.15 Nonfoil Daily $0.02 +1% Weekly $0.05 +2% Monthly $0.11 +5% Foil Daily $0.03 +1% Weekly -$0.05 -1% Monthly -$0.10 -3% Other printings Found In This print Jecht, Reluctant Guardian Menace Whenever Jecht deals combat damage to a player, you may exile it, then return it to the battlefield transformed under its owner's control.
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Each spell with overload has a target, but if you cast it for its overload cost rather than its mana cost, you can change the word "target" to "each," or what the Izzet used to call "restraint." Remember that a spell with targets can fail to resolve because its targets become illegal, but once you overload it, it no longer has targets, so it can no longer fail to resolve this way