You could also look to include Pinocchio - Star Attraction as well
At the beginning of combat on your turn, another target creature you control gains haste and gets +X/+X until end of turn, where X is that creature's power
#16 - Phantump #17 - Trevenant #19 - Dhelmise #34 - Houndoom #24 - Litwick #25 - Lampent #26 - Chandelure #62 - Pikachu #95 - Lycanroc #102 - Galarian Runerigus #64 - Gastly #65 - Haunter #66 - Gengar #69 - Duskull #70 - Dusclops #71 - Dusknoir #87 - Shuppet #73 - Banette #88 - Mismagius #89 - Drifloon #90 - Drifblim #97 - Mimikyu #80 - Marshadow #81 - Spectrier #89 - Sinistea #90 - Polteageist #104 - Greavard #106 - Houndstone #103 - Zubat #131 - Murkrow
It will be good in any deck with eight Plains, and every Mount creature you have in addition to that simply makes it stronger
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However, if a single creature you control with lifelink deals combat damage to multiple creatures, players, and/or planeswalkers at the same time (perhaps because it has trample or was blocked by more than one creature), the ability will apply only once