Druid Class 

Enchantment — Class
(Gain the next level as a sorcery to add its ability.)
Landfall — Whenever a land you control enters, you gain 1 life.
{2}{G}: Level 2
You may play an additional land on each of your turns.
{4}{G}: Level 3
When this Class becomes level 3, target land you control becomes a creature with haste and "This creature's power and toughness are each equal to the number of lands you control." It's still a land.
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Cards that do something similar expected a card that isn't here?
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Courser of Kruphix 100%
$2.15#1229
"Whenever a land you control enters, you gain 1 life."
+1 more matching line
Omnath, Locus of Creation 91%
$4.80#4103
"Whenever a land you control enters, you gain 4 life if this is the first time this ability has resolved this turn. If it's the second time, add {R}{G}{W}{U}. If it's the third time, this card deals 4 damage to each opponent and each planeswalker you don't control."
Spectrum Sentinel 81%
$0.34#6019
"Whenever a nonbasic land an opponent controls enters, you gain 1 life."