Sejiri Merfolk 

Creature — Merfolk Soldier
$0.16 #28112 0.00 16.6 years
As long as you control a Plains, this creature has first strike and lifelink. (Damage dealt by a creature with lifelink also causes its controller to gain that much life.)
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"As long as this creature is equipped, it has first strike and lifelink."
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"This creature gets +1/+1 as long as you control a Plains."
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"At the beginning of each player's upkeep, if that player controls a Plains, they gain 1 life."
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"• This creature gains first strike and lifelink until end of turn."
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"
: This creature gains lifelink until end of turn."
Ritual Guardian73%
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"At the beginning of combat on your turn, if you control three or more creatures with different powers, this creature gains lifelink until end of turn."
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"During your turn, this creature has first strike."
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"As long as you control an enchantment, this creature gets +1/+1 and has lifelink."