Shell Shield 
Instant
Kicker {1} (You may pay an additional {1} as you cast this spell.)
Target creature you control gets +0/+3 until end of turn. If this spell was kicked, that creature also gains hexproof until end of turn. (It can't be the target of spells or abilities your opponents control.)
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Cards that do something similar expected a card that isn't here?
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Mage Duel 97%
$0.10#21489
"Target creature you control gets +1/+2 until end of turn. Then it fights target creature you don't control."
Chelonian Tackle 97%
$0.20#19374
"Target creature you control gets +0/+10 until end of turn. Then it fights up to one target creature an opponent controls."
Ruthless Predation 97%
$0.16#18582
"Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control."
Epic Confrontation 97%
$0.08#15665
"Target creature you control gets +1/+2 until end of turn. It fights target creature you don't control."
Cheeky House-Mouse // Squeak By 96%
$0.31#10106
"Target creature you control gets +1/+1 until end of turn. It can't be blocked by creatures with power 3 or greater this turn."
Ambuscade 96%
$0.11#19478
"Target creature you control gets +1/+0 until end of turn. It deals damage equal to its power to target creature an opponent controls."
Huatli's Final Strike 96%
$0.10#18495
"Target creature you control gets +1/+0 until end of turn. It deals damage equal to its power to target creature an opponent controls."
Assert Perfection 96%
$0.13#17466
"Target creature you control gets +1/+0 until end of turn. It deals damage equal to its power to up to one target creature an opponent controls."
Rabid Gnaw 96%
$0.20#7808
"Target creature you control gets +1/+0 until end of turn. Then it deals damage equal to its power to target creature you don't control."
Swift Kick 95%
$0.03#25321
"Target creature you control gets +1/+0 until end of turn. It fights target creature you don't control."
Clear Shot 95%
$0.08#11880
"Target creature you control gets +1/+1 until end of turn. It deals damage equal to its power to target creature you don't control."
Hunter's Mark 95%
$0.12#21937
"Target creature you control gets +1/+1 until end of turn. Then it deals damage equal to its power to target creature or planeswalker you don't control."
Rhino's Rampage 95%
$0.49#12449
"Target creature you control gets +1/+0 until end of turn. It fights target creature an opponent controls. When excess damage is dealt to the creature an opponent controls this way, destroy up to one target noncreature artifact with mana value 3 or less."