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Artifact
When Wolfrider's Saddle enters the battlefield, create a 2/2 green Wolf creature token, then attach Wolfrider's Saddle to it. Equipped creature gets +1/+1 and can't be blocked by more than one creature. Equip {3} ({3}: Attach to target creature you control. Equip only as a sorcery.)
Creature
Indestructible As long as your devotion to green and white is less than seven, Karametra isn't a creature. Whenever you cast a creature spell, you may search your library for a Forest or Plains card, put it onto the battlefield tapped, then shuffle.
Flying, protection from black Echo {3}{W}{W} (At the beginning of your upkeep, if this came under your control since the beginning of your last upkeep, sacrifice it unless you pay its echo cost.) When Karmic Guide enters the battlefield, return target creature card from your graveyard to the battlefield.
At the beginning of your upkeep, create a 2/2 green Wolf creature token. {T}: Tap all untapped Wolf creatures you control. Each Wolf tapped this way deals damage equal to its power to target creature. That creature deals damage equal to its power divided as its controller chooses among any number of those Wolves.
Champion an Elf (When this creature enters the battlefield, sacrifice it unless you exile another Elf you control. When this creature leaves the battlefield, that card returns to the battlefield.) {2}{G}: Create a 2/2 green Wolf creature token. Wolves you control have deathtouch.
When Yasharn enters the battlefield, search your library for a basic Forest card and a basic Plains card, reveal those cards, put them into your hand, then shuffle. Players can't pay life or sacrifice nonland permanents to cast spells or activate abilities.
Enchantment
Enchant creature As long as enchanted creature is green, it gets +1/+1 and has indestructible. (Damage and effects that say "destroy" don't destroy it. If its toughness is 0 or less, it's still put into its owner's graveyard.) As long as enchanted creature is white, it gets +1/+1 and has flying.