Since these fellas are Devack cards, I'll try to make them fit a certain...simian variety.
EARTH/Beast-Type Effect Monster/Level 1/0 ATK/1200 DEF
Lore: If this card is sent from the hand or field to the GY to activate a Beast monster's effect, or by a Beast monster's effect: You can Special Summon this card from your GY, but banish it when it leaves the field. Once per turn (Quick Effect): You can target 1 Beast monster you control and 1 other monster on the field; change them to Defense Position. Then, for each monster whose battle position was not changed by this effect, draw 1 card.
DARK/Beast-Type Tuner Effect Monster/Level 2/300 ATK/1200 DEF
Lore: You can discard this card; Set 1 "Closed" Spell/Trap directly from your Deck. During your Main Phase, you can Normal Summon 1 DARK Beast monster in addition to your Normal Summon/Set. (You can only gain this effect once per turn.) If the ATK, Level or battle position of a Beast monster(s) you control changes: You can destroy 1 card on the field. You can only use this effect of "Forest Ape" up to thrice per turn.
Closed Forest of Zeman
Field Spell Card
Lore: When this card is activated: You can Special Summon 1 Beast monster from your hand. Once per turn, if a Beast monster(s) is Special Summoned to your field: You can pay 1000 LP; add 1 Beast monster with 1200 or 1800 DEF and a different Attribute from the Summoned monster from your Deck or GY to your hand. If you Special Summoned a Beast Synchro Monster this way, you can Special Summon that monster, instead. During the Battle Phase only, all Beast monsters you control gain 100 ATK for each Beast monster in your GY.
Quick-Play Spell Card
Lore: Send 2 Beast monsters with 1200 DEF from your Deck to the GY, (1 Tuner & 1 non-Tuner monster), and if you do, all monsters your opponent currently controls whose ATK is between those sent monsters' ATK cannot activate their effects for the rest of the turn, except Beast monsters. You can banish this card from your GY, then target 1 Beast Synchro Monster in your GY; Special Summon it, and if you do, you lose LP equal to its ATK. You can only use 1 Closed-Off" effect per turn, and only once that turn.
Exile to the Closed Forest
Normal Trap Card
Lore: Target 1 Beast monster you control with 1200 DEF: apply 1 of these effects.
• Change its battle position, and if you do, it gains 1200 ATK/DEF until the End Phase, also it is unaffected by other card effects this turn.
• Tribute it, and if you do, Special Summon 1 monster with 1200 DEF from your hand or Deck.
If a card(s) you control would be destroyed by a card effect while you control "Closed Forest", you can banish this card from your GY, instead.
Alkum the Ape Prince
DARK/Beast-Type Synchro Effect Monster/Level 6/1800 ATK/2500 DEF
Lore: 1 EARTH Tuner + 1+ non-Tuner monsters with 1200 DEF
If this card is Synchro Summoned: You can make the ATK of 1 non-Beast monster on the field become 100. This card can attack all monsters your opponent controls whose current ATK is different from their original ATK, once each. If this card attacks an opponent's Defense Position monster, inflict piercing battle damage to your opponent. Once per turn, if a monster with less ATK than its DEF activates its effect (Quick Effect): You can send 1 Beast monster from your hand or Deck to the GY;, banish 1 card on the field.