Infinite 4/4 and mana, draw, life

Whenever a creature enters, you may add an amount of equal to the number of creatures you control that share a creature type with it.

: Untap this artifact. , : You gain 1 life. , : Untap target creature. , : Tap target creature. , : Draw a card.

Whenever another creature you control enters, that creature gets +3/+3 until end of turn.

Enchant creature Enchanted creature has ": Create X 1/1 red Elemental creature tokens with haste, where X is this creature's power. Exile them at the beginning of the next end step."